Opinion for the Court filed by Circuit Judge HARRY T. EDWARDS.
Concurring opinion filed by Circuit Judge SILBERMAN.
HARRY T. EDWARDS, Circuit Judge:
The Communications Satellite Corporation (“Comsat”) has petitioned for review of an order entered by the Federal Communications Commission (“FCC” or the “Commission”) under section 214 of the Communications Act, 47 U.S.C. § 214 (1982), which authorizes Teleport International, Ltd. (“Teleport”) and American Satellite Company (“ASC”) to use domestic satellite facilities to provide international telecommunications services between the United States and Jamaica. While applicable law, treaty obligations and FCC precedent generally require that international communications be routed through the International Telecommunications Satellite Organization (“In[461]*461telsat”) and its domestic affiliate Comsat, the FCC approved the Teleport/ASC application in reliance on its previously established “transborder policy.” That exception to the general rule permits operators of satellites used for domestic communications to provide services to foreign points within the satellite’s coverage area (“footprint”) in cases where the Intelsat system could not provide the service or where it would be “uneconomical or impractical” for it to do so.
We find that, contrary to the position advanced by Comsat, the Teleport/ASC application was properly considered under the transborder policy. It is not an unfair reading of the Commission’s precedent to apply the transborder policy whenever the proposed service is incidental to a domestic satellite; it need not be incidental to an existing domestic service to fall within the scope of the transborder policy. Furthermore, the Commission’s subsequently adopted “separate systems” policy in no way altered the transborder policy, so “separate systems” considerations have no application to this case.
The Commission did not, however, adequately explain its decision that the Teleport/ASC proposal met the criteria of the transborder policy. In the first place, it did not confront the question whether a finding that Intelsat service would be uneconomical could be based solely on a price comparison, or whether — in light of the protectionist policy in favor of Intelsat embodied in applicable law and treaties — some qualitative difference (such as duplication of facilities or multiple satellite hops for service via Intelsat) is required. Second, the FCC totally failed to consider the argument presented by Comsat below that the Intelsat system could provide the service at a much lower price than the Commission believed. Finally, the Commission did not make it clear that the applicants had demonstrated impracticality on other grounds. We therefore reverse the FCC’s decision and remand to the Commission for reconsideration of these questions.
I. Background
A. Regulatory Background ■
The legal framework for United States international satellite telecommunications policy is to be found in several documents. The Communications Satellite Act of 1962, 47 U.S.C. §§ 701 et seq. (1982), established Comsat, a private, for-profit corporation, as the vehicle for United States participation in the envisioned global system. The Act also declared the policy objective of cooperation with other countries in the development of this system. At the same time it left the door open for the creation of additional satellite systems “if required to meet unique governmental needs or if otherwise required in the national interest.” 47 U.S. C. § 701(d). An interim international agreement was concluded in 19641 and subsequently superseded by a permanent “Intelsat Treaty.” 2 The Intelsat Treaty provided notably, in its article XIV(d), that any party wishing to use non-Intelsat “space segment facilities” (i.e., satellites) for international public telecommunications services must undertake a consultation process with Intelsat to ensure (a) that the proposed arrangement was technically compatible with Intelsat facilities, and (b) that it would not create “significant economic harm to the global system of INTELSAT.”
The Intelsat Treaty also provided, in article V(d), that “[t]he rates of space segment utilization charge for each type of utilization shall be the same for all applicants for space segment capacity for that type of utilization.” Intelsat is thus obligated to charge a uniform rate for the same service provided on any of its routes, even though traffic on certain routes is much heavier, and therefore more profitable, than on others.3 The effect of these “globally aver[462]*462aged rates” has been to provide a subsidy for service to the less developed countries. See Caplan, The Case For and Against Private International Communications Satellite Systems, 26 Jurimetrics J. 180, 187, 194-95 (1986). This arrangement is consistent with Congress’ policy declaration in the Communications Satellite Act, which mandated that in developing the new international telecommunications services, “care and attention will be directed toward providing such services to economically less developed countries and areas as well as those more highly developed____” 47 U.S.C. § 701(b). It makes it difficult, however, for Intelsat to compete effectively on the most lucrative routes with any private system that is free to offer service only on those routes. See Caplan, supra, at 194.
Since 1981, the FCC has developed two exceptions to the general rule that all international satellite communications are to be carried by the Intelsat system. The first is the “transborder policy,” under which the Commission has allowed the use of existing domestic satellites for the provision of service on an incidental basis to foreign points within the satellite’s footprint. When applications to provide such service were first made, an interagency task force in the Executive Branch studied the issue to determine compatibility with United States obligations under the Intelsat Treaty. Its conclusions were stated in a July 1981 letter from Undersecretary of State James L. Buckley to FCC Chairman Mark Fowler.4 The “Buckley Letter” attempted to give content to the statutory provision that “additional” satellite systems were not precluded “if otherwise required in the national interest.” 47 U.S.C. § 701(d). It explained that
[c]ertain exceptional circumstances may exist where it would be in the interest of the United States to use domestic satellites for public international telecommunications with nearby countries. One such case would be where the global system could not provide the service required. Another case would be where the service planned would be clearly uneconomical or impractical using the INTELSAT system____ [T]he burden of proof for demonstrating that sound technical, operational or economic reasons warrant reliance on domestic satellites for international purposes must rest with proponents of such use.
88 F.C.C.2d at 288. In cases such as these, the letter continued, the State Department would be prepared to initiate the consultation process required under article XIV(d) of the Intelsat Treaty.
The first set of transborder applications, conditionally approved by the FCC in October 1981, involved two types of projects. One was the provision of U.S. television programming, already being carried on domestic satellites, to receive-only earth stations in Canada, Central America and the Caribbean. Transborder Satellite Video Services (“Transborder I"), 88 F.C.C.2d 258 (1981). The other was the extension of private U.S. two-way communications networks (such as corporate communications systems) to locations in Canada. American Satellite Co., 88 F.C.C.2d 178 (1981); Satellite Business Sys., 88 F.C.C.2d 195 (1981). In both cases, use of the Intelsat system for the requested service extension would have necessitated using a second satellite and a second transmit earth station. The Commission expressly relied upon the Buckley Letter as its guide. Applying the Letter’s criteria, it found that while Intelsat was technically able to provide the services in question, it would be uneconomical and impractical for it to do so. Transborder-1, 88 F.C.C.2d at 272-73, 279-82; American Satellite Co., 88 F.C.C. 2d at 182-83, 187-90; Satellite Business Sys., 88 F.C.C.2d at 199-200, 205-08. The Commission has now approved “well over one hundred” transborder applications. [463]*463Teleport Int’l Ltd. & American Satellite Co., 1 F.C.C.Rcd. 101, 103 (1986).
The second exception to the use of Intelsat for international communications is the more recent “separate systems” policy. This policy was developed in 1984 in response to proposals for the construction of non-Intelsat satellite systems specifically for international service. Following a Presidential Determination “that separate international communications satellite systems are required in the national interest,” 5 the Secretaries of State and Commerce, pursuant to the President’s instructions, asked the FCC to restrict such separate systems authorizations to private-line systems “not interconnected with public-switched message networks.” 6 This restriction was deemed necessary to protect the economic viability of the Intelsat system, whose core business was public-switched communications. The Commission, while approving the concept of separate systems, adopted this restriction in Establishment of Satellite Systems. Providing International Communications, 101 F.C.C.2d 1046 (1985).
Soon after the separate systems policy was adopted, Congress undertook to write it into law as part of the 1986-87 Foreign Relations Authorization Act (“FRAA”), Pub.L. No. 99-93, § 146, 99 Stat. 405, 425-26 (1985). This enactment specified that it was U.S. policy to promote separate systems as long as they were technically compatible with Intelsat and avoided “significant economic harm” to its system, id., § 146(a), and as long as they complied with the Executive Branch conditions established pursuant to the Presidential Determination — i.e., the limitation to non-public-switched systems. Id., § 146(b)(1). In its definitional section, the legislation defined “separate system” so as to exclude the kind of proposals the Commission had considered under its transborder policy. The term “separate system,” it stated, “shall not include any satellite or system of satellites established — (1) primarily for domestic telecommunications purposes and which incidentally provides services on an ancillary basis to points outside the jurisdiction of the United States but within the western hemisphere____” Id., § 146(g).
B. The Present Application
The application in the present case is part of a plan to move jobs in information delivery services offshore to Jamaica. Teleport and ASC propose to lease private lines to U.S. businesses for voice, data and video services, thus permitting the employment of Jamaican labor for services such as remote data entry, electronic transcription services, electronic document distribution, video teleconferencing, telemarketing, reservation services, specialized non-switched voice services, and database upkeep, manipulation and maintenance. See Brief for Respondents at 14 n. 41. Since “a word processor or data entry worker in the United States is paid eight times more than a similar worker in Jamaica,” Teleport/ASC Reply Comments at 9 n. 4, Appendix (“App.”) 54, it appears that the lower cost of Jamaican labor would more than offset the communication costs. Teleport plans initially to lease 400 circuits between the United States and Jamaica via an ASC domestic satellite, half of them from New York and half from Atlanta. Expansion of the system to provide service to other U.S. cities is contemplated for the future.
In their comments below, Teleport and ASC argued that their proposal was consistent with previous transborder decisions. Intelsat’s system, they stated, would not be technically capable of serving customers in the western part of the United States (when the system expanded there), and in any case could not provide service sufficiently economically to make the program viable. They also argued that since the communications traffic would be newly [464]*464generated, it would entail no loss of revenue to the Intelsat system. Teleport/ASC Application, App. 1-15; Teleport/ASC Reply Comments, App. 44-64. The Teleport/ASC application was supported by the Government of Jamaica, which pointed to the new jobs and government revenue the project would bring, Comments of the Government of Jamaica, App. 37-41, and by the National Telecommunications and Information Administration (“NTIA”), a Commerce Department entity which is the Executive Branch agency principally charged with the development of telecommunications policy. NTIA argued that the application would further the President’s Caribbean Basin Initiative and U.S. foreign policy interests generally. Comments of the NTIA, App. 67-71. Comsat, on the other hand, petitioned the FCC to deny the application, arguing that it was a major departure from previous transborder approvals and in any case failed to meet the Buckley Letter’s criteria. Comsat also suggested that the proposal might violate the separate systems policy, because there were indications that its service would be connected to public-switched networks. Comsat Petition to Deny, App. 20-27; Com-sat Reply, App. 72-90.7
On October 9, 1986, the FCC conditionally granted the Teleport/ASC application. Teleport Int’l Ltd. & American Satellite Co. (“Teleport/ASC”), 1 F.C.C.Rcd. 101 (1986). Noting that the proposal had the support of both the Government of Jamaica and the U.S. Executive Branch, the Commission found that the application fell within the scope of the transborder policy because its proposed service was within the footprint of a domestic satellite. The proposed service was “not radically different” from transborder services approved for Canada and Mexico, and the fact that Jamaica was not contiguous to the United States was of no consequence as long as it fell within the domestic satellite’s footprint. The fact that no two-way service had ever been approved to Caribbean locations simply reflected the fact that none had ever been considered by the Commission. Id. at 103-04. The FCC also rejected Comsat’s argument that the proposal violated the separate systems policy’s ban on access to public-switched networks. The separate systems policy, the Commission stated, had not been intended to change the transborder policy in any way; moreover, the separate systems policy dealt with the construction of separate international satellite systems and therefore had no application to a request to use a domestic satellite for specialized international service within its footprint. Id. at 104.
Evaluating the proposal under the Buckley Letter’s criteria, the FCC first determined that Intelsat was capable of providing the service. Id. The Commission found, however, that service by Intelsat would be “clearly uneconomical and impractical.” It determined that Intelsat service would cost at least $1,560 per month for each circuit, which was far greater than the monthly charge of $575 “cited by the applicants.” This cost disparity made use of the Intelsat system “clearly uneconomical.” Moreover, as the Teleport/ASC project was based on the low cost of Jamaican labor, using Intelsat service would make it prohibitively expensive. The Commission also found that earth stations for Intelsat’s IBS service8 were not yet authorized for all of the western U.S. cities to which Teleport/ASC ultimately intended to provide service; thus, serving those locations via Intelsat would require a domestic satellite hop or the use of terrestrial lines, making use of Intelsat “clearly uneconomical and impractical.” Id.9
[465]*465Finding that the Teleport/ASC proposal met the criteria of the Buckley Letter for transborder service, the Commission conditionally granted the application, pending the completion of the Intelsat consultation process required under Article XIV(d) of the Intelsat Treaty. Id. at 105. In April 1987, Intelsat determined that the proposal was technically compatible with its system and would not cause significant economic harm to the Intelsat system. The FCC thereupon issued a final authorization to Teleport and ASC. Teleport Int’l Ltd. & American Satellite Co., 2 F.C.C.Rcd. 4149 (1987). Comsat petitioned this court for review of the Commission’s order.
II. Analysis
Comsat argues on appeal that the FCC’s approval of the Teleport/ASC application was arbitrary and capricious because it was an unexplained departure from the Commission’s prior practice. In particular, Comsat suggests that the Teleport/ASC project does not fall within the class of applications previously considered under the transborder policy; that in any case it did not meet the criteria the Commission has applied when it has considered applications under that policy; and that the application should have been considered and rejected under the separate systems policy.
In considering Comsat’s challenge, we are constrained by the “arbitrary and capricious” standard of review. The Supreme Court has defined the standard, as follows:
The scope of review under the “arbitrary and capricious” standard is narrow and a court is not to substitute its judgment for that of the agency. Nevertheless, the agency must examine the relevant data and articulate a satisfactory explanation for its action including a “rational connection between the facts found and the choice made.” Burlington Truck Lines, Inc. v. United States, 371 U.S. 156, 168, 83 S.Ct. 239, 246, 9 L.Ed.2d 207 (1962). In reviewing that explanation, we must “consider whether the decision was based on a consideration of the relevant factors and whether there has been a clear error of judgment.” Bowman Transportation, Inc. v. Arkansas-Best Freight System, Inc., [419 U.S. 281, 285, 95 S.Ct. 438, 442, 42 L.Ed.2d 447 (1974) ]; Citizens to Preserve Overton Park v. Volpe, [401 U.S. 402, 416, 91 S.Ct. 814, 823, 28 L.Ed.2d 136 (1971) ]. Normally, an agency rule would be arbitrary and capricious if the agency has relied on factors which Congress has not intended it to consider, entirely failed to consider an important aspect of the problem, offered an explanation for its decision that runs counter to the evidence before the agency, or is so implausible that it could not be ascribed to a difference in view or the product of agency expertise. The reviewing court should not attempt itself to make up for such deficiencies; we may not supply a reasoned basis for the agency’s action that the agency itself has not given. SEC v. Chenery Corp., 332 U.S. 194, 196 [67 S.Ct. 1575, 1577, 91 L.Ed. 1995 (1947). We will, however, “uphold a decision of less than ideal clarity if the agency’s path may reasonably be discerned.” Bowman Transportation, Inc. v. Arkansas-Best Freight System, Inc., supra, [419 U.S.] at 286 [95 S.Ct. at 442], See also Camp v. Pitts, 411 U.S. 138, 142-143 [93 S.Ct. 1241, 1244, 36 L.Ed.2d 106] (1973) (per curiam ).
Motor Vehicle Mfrs. Ass’n v. State Farm Mut. Auto. Ins. Co., 463 U.S. 29, 43, 103 S.Ct. 2856, 77 L.Ed.2d 443 (1983). If, as Comsat asserts, the FCC has departed from established policy, then we must determine whether the agency has acted pursuant to “reasoned analysis indicating that prior policies and standards are being deliberately changed, not casually ignored.” Greater Boston Television Corp. v. FCC, 444 F.2d 841, 852 (D.C.Cir.1970), cert. denied, 403 U.S. 923, 91 S.Ct. 2233, 29 L.Ed.2d 701 (1971).
In applying the arbitrary and capricious standard in this case, we rely on the Commission’s prior decisions and on the Buckley Letter. The legal significance of the latter derives from its explicit adoption by the Commission as its guide in evaluating [466]*466transborder applications.10 All parties agree that the Buckley Letter has been embraced by the FCC as the basis for its transborder policy, and that transborder applications are therefore to be judged by its principles. See Brief of Petitioner at 8, 33; Brief for Respondents at 7-8. Indeed, the FCC explicitly stated in this case that it was “[ajpplying the criteria of the Buckley letter.” 1 F.C.C.Rcd. at 104.
A. The Scope of the Transborder Policy
We turn first to the question whether the Teleport/ASC application was properly considered under the transborder policy, and whether the Commission’s more recently adopted separate systems policy should have any bearing on its consideration.
The scope of the transborder policy has never been precisely defined. Rather, it must be inferred from the Buckley Letter and the Commission’s prior decisions. The Buckley Letter gives only two clues to any limitation on the policy’s scope: it refers to the use of “domestic satellites” and to service to “nearby countries.” 88 F.C.C.2d at 288. Thus, any further limitation on the scope of the transborder policy must be found in the Commission’s decisions.
The present decision goes beyond previously approved transborder proposals by approving two-way service to a location other than Canada or Mexico. Except for those two countries, all previous transborder approvals had been for one-way service (principally television transmissions) “which can be received as a by-product of a primary U.S. domestic transmission.” Teleport/ASC, 1 F.C.C.Rcd. at 103. The Commission had approved service to Canada and Mexico, however, that involved “use of a domestic satellite for private-line communications for the provision of specialized two-way data communications,” including “specialized video services ... unrelated to any domestic component.” Id. The fact that such two-way service had never before been approved for the Caribbean countries is apparently due simply to the fact that “[n]o two-way service between the U.S. and Caribbean locations has ever been considered by the Commission.” Id. at 104.11
The fact that the proposed service goes beyond the precise factual circumstances of what had previously been approved does not necessarily mean that it is a departure from previous policy. We see no reason to conclude that applying the transborder policy to the Teleport/ASC proposal is inconsistent with that policy’s rationale. We have found no indication that the FCC has ever rejected any application for service within a domestic satellite’s footprint, on the basis that such.service was outside the scope of the transborder policy.12 Nor has the FCC ever stated that the transborder policy was more restrictive than it now interprets it to be.
Comsat’s argument to the contrary boils down to the assertion that the transborder policy applies only to service that is “incidental ... to domestic services already being carried on domestic satellites.” Brief of Petitioner at 25. This argument does [467]*467not withstand scrutiny. Comsat points, id. at 80-31, to the statement in most of the transborder cases that the proposals under consideration “generally involve only the incremental expansion of existing domestic satellite services or networks rather than the introduction of new international services.” E.g., American Tel. & Tel. Co. (“Transborder III”), File No. I-P-C-82-048, Mimeo. No. 6119, 11 50 (FCC Aug. 26, 1983), reprinted in Supplemental Appendix (“S.A.”) 55, 73. The key to this boilerplate passage is the word “generally.” Several of the applications13 approved in Trans-border III, for example, were in fact for “all forms of private-line services,” id., 1147, S.A. 71, a phrase that would certainly seem to encompass the present application.
In fact, when the Commission uses the term “incidental,” it does so in a context that supports the interpretation that trans-border service must be incidental to a domestic satellite, rather than incidental to a domestic service. In one case, for example, the FCC said in regard to domestic satellites: “We continue to view the use of these satellites for transborder services to Canada and points in the Caribbean, Central and South America as an incidental or secondary use.” Western Union Tel. Co. (“Transborder V”), File No. I-T-C-83-068, Mimeo No. 3286, 1132 (FCC Apr. 4, 1984) (emphasis added), reprinted in S.A. 98, 118.14
Comsat’s “incidental to service” understanding of the scope of the transborder policy would, moreover, render the content of that policy meaningless. If the only proposals to be considered under the trans-border policy were those that were incidental to existing domestic service, it is hard to imagine that the FCC could ever find Intelsat service to be anything other than “uneconomical and impractical” — for if the service were already being provided domestically, extending it to another country could inevitably be done without the duplication of facilities or multiple hops that would be necessary for Intelsat to provide the service. Only in the case of some new service would the possibility arise that Intelsat service might not be uneconomical or impractical by comparison to the use of a domestic satellite. Thus, the question whether the proposed service is incidental to an existing service is meaningful not in determining whether the proposal falls within the scope of the transborder policy, but only in ascertaining whether it meets the criteria of that policy, namely the conditions articulated in the Buckley Letter.15
We conclude that the FCC’s understanding that the transborder policy can be applied where the proposed service is incidental to a domestic satellite (but not necessarily incidental to an existing domestic service) is not an unfair reading of the Commission’s own policy and past practice.16 Thus, it was not arbitrary and capri[468]*468cious for the FCC to evaluate the present application under the criteria of the trans-border policy.
This conclusion is in no way called into question by the FCC's separate systems policy. The Commission pointed out in its decision below that “the Separate Systems decisions was [sic] not intended to change Transborder policy in any way.” 1 F.C.C. Red. at 104. Comsat concedes this point. Brief of Petitioner at 43. And the FRAA clearly excludes transborder cases from its definition of separate systems. Pub.L. No. 99-93, § 146(g), 99 Stat. at 426. In any case, the basic documents on which the separate systems policy is based make clear that what is at issue there is systems of satellites. Both Presidential Determination 85-2 and the letter of the Secretaries of State and Commerce speak of “separate international communications satellite systems.” 17 The separate systems policy was developed to deal with proposals for the construction of non-Intelsat satellite systems devoted to international service. As there is no question of such systems in the Teleport/ASC proposal, the separate systems policy has no application to this case.
B. Application of the Buckley Criteria
The Buckley Letter, it will be recalled, established that the use of domestic satellites for international communications could be justified under two “exceptional circumstances.” The first consisted of cases where Intelsat could not provide the requested service. The second embraced situations where service via the Intelsat system would be “clearly uneconomical or impractical.” 88 F.C.C.2d at 288. The Letter also specified that the burden of proof for demonstrating that these criteria were met rested with the proponent of the trans-border service. Id.
The Commission rejected the argument of Teleport and ASC that Intelsat would be incapable of providing the service. It found that Intelsat’s satellite located at 307°, which carries Intelsat’s IBS service, could provide the service Teleport and ASC proposed. 1 F.C.C.Rcd. at 104.18 Thus, the only question is whether the FCC was justified in determining that Intelsat service would be “uneconomical or impractical.”
On this point, we find that the Commission’s explanation of its conclusion fails to satisfy the “arbitrary and capricious” standard. First, the Commission provided no explanation for its decision to base a finding of “uneconomical” solely on comparative price data. This decision requires an explanation, both because it is a departure from prior practice and because it makes no sense in light of the clear purpose of all applicable statutes and treaties to shield Intelsat from price competition. Second, even if comparative price data is a sufficient basis for this determination, the FCC totally failed to consider the claim advanced by Comsat below that Intelsat could provide the service at a much lower price than that cited by the Commission. Finally, it is not clear from the FCC’s opinion that the applicants have shown how Intelsat service would be impractical on grounds other than price. These shortcomings are particularly troubling because the [469]*469Buckley Letter places the burden on the applicant to show that Intelsat service would be uneconomical or impractical.
1. Reliance on Comparative Prices
We are troubled, first of all, by the FCC’s apparent willingness to base a finding of “uneconomical” solely on the fact that Intelsat would charge a higher price for the service than would a domestic competitor. As we have seen, higher prices for international service are to some degree inherent in Intelsat’s system of globally averaged rates, mandated under article V(d) of the Intelsat Treaty. Both that treaty and the Communications Satellite Act envisioned a regime under which Intelsat would be protected from full-scale competition in the interest of other, overriding goals, including promotion of world peace and understanding, provision of satellite communications technology to all nations, and most effective use of the limited frequency spectrum and the geostationary orbit. The Buckley Letter explicitly embraces these goals and the protected place of the Intelsat global system in U.S. satellite communications policy, even while permitting a limited exception to exclusive reliance on Intelsat for international satellite communications. See 88 F.C.C.2d at 287-88. The Commission’s position seemingly would open the door to full-scale price competition between Intelsat and domestic satellite systems. The result would be that any international route that fell within a domestic satellite’s footprint could gain approval under the transborder policy, as long as the applicant could offer a lower price than Intelsat. We are hard pressed to understand how such an outcome is compatible with the Buckley Letter, not to mention the Communications Satellite Act and the Intelsat Treaty.
What’s more, the comparative-price approach appears to mark a significant departure from prior FCC practice. In earlier transborder cases, the Commission’s findings of “uneconomical” have been based on determinations that use of the Intelsat system would require multiple satellite hops, additional terrestrial links, or duplication of facilities. In other words, the difference between the proposed service and possible Intelsat service always has involved a qualitative component.19 This is clear in the three foundation cases of the transborder policy. See Transborder I, 88 F.C.C.2d at 280-81 (duplication of existing programming on a second network); American Satellite Co., 88 F.C.C.2d at 189 (virtual duplication of the customer’s network); Satellite Business Sys., 88 F.C.C.2d at 206-07 (virtual duplication of the SBS system for each customer). It also emerges from the more than 100 transborder applications the FCC has granted. In its decision below, the Commission summarized the bases for its findings of “uneconomical” in those cases: Applications to extend video services to transborder points had been granted on the basis that use of Intelsat facilities would require multi-satellite hops and additional terrestrial facilities, and — by duplicating programming already available on domestic satellites — would be an inefficient use of the radio spectrum. In regard to business service applications, the findings of "uneconomical” were based on the necessity of duplicating networks already in place, the necessity of multi-satellite hops and terrestrial links to reach customers, and the inefficient use of the radio spectrum.20 Here, by contrast, the [470]*470proposed service appears to be an entirely new one which could be carried either by the Intelsat system or by domestic facilities, without any duplication.
In view of the protectionist purpose embodied in the Communications Satellite Act, the Intelsat Treaty and the Buckley Letter, and because the FCC departed from its prior practice without providing a reasoned explanation, we find it necessary to remand this case for further consideration by the Commission. On remand, the FCC should squarely address the issue of whether a finding that Intelsat service is “uneconomical” can be based on a price comparison alone. The Commission’s conclusion must, of course, be based on a reasoned analysis of the relevant documents.21
2. Comsat’s Price Data
Even if we were to assume that a finding of “uneconomical” could be based on comparative price data, we would find it necessary to remand to the Commission because of its total failure, in weighing the cost of ASC and Intelsat service, to consider Com-sat’s argument that it could provide the service at a significantly lower price than that assumed by the Commission.
The Commission, on the basis of Com-sat’s estimated monthly cost of $780 per IBS half circuit, and assuming a similar charge for the Jamaican end, found that the monthly charge for a circuit via the Intelsat system would be $1,560. This figure, it stated, would be more than two and one-half times greater than the monthly charge of $575 “cited by the applicants.”22 1 F.C.C.Rcd. at 104. The FCC totally ignored, however, Comsat’s representation that the IBS circuits could be multiplexed to derive up to five “voice grade circuits,” with the result that the actual monthly cost per channel would be about $312 rather than $1,560. Comsat Reply at 8, App. 83.
At oral argument, counsel for the FCC conceded that the Commission had not addressed Comsat’s argument about the possibility of multiplexing.23 He also agreed that if Intelsat service could indeed be provided for $312, this would be dispositive of the case. In its defense, the FCC states that it was under no obligation to consider a comment advanced in “a single, cryptic, unsupported sentence,” and that this was not the kind of “significant” comment it need consider. Brief for Respondents at 34 n. 76. We cannot agree. The fact that Comsat’s representation, if true, would in itself be dispositive of the case should suffice to make it a “significant” comment demanding consideration. Moreover, the comment’s brevity does not distinguish it from the representation made by Teleport and ASC as to the price they would offer, and it is, if anything, less “cryptic” than the Teleport/ASC representation, which the Commission had no difficulty in credit[471]*471ing.24 Finally, the Buckley Letter specifically directs the Commission to credit information provided by Comsat about the conditions under which Intelsat service could be supplied: “The U.S. Signatory, the Communications Satellite Corporation (COM-SAT), can supply the Commission with information on the ability of the global system to provide the required service____” 88 F.C.C.2d at 288.
On remand, if it reaches this issue, the Commission must revisit its determination of the relative costs of the two systems, giving due consideration to the argument advanced by Comsat that Intelsat service could be provided at a rate much lower than that assumed by the Commission.
3. Impractical on Other Grounds
Should the FCC conclude on remand that a finding of “uneconomical” requires more than a price comparison, it may then consider whether the applicant has carried its burden of showing other grounds for a finding that Intelsat service would be “uneconomical or impractical.” It could carry this burden, for example, by showing that the Intelsat system could not provide the service in question in its entirety and without duplication of facilities, and that the domestic satellite system could more nearly do so. In the present context, the issue appears to turn on the locations of the two systems’ earth stations.
It is undisputed that both ASC and Intelsat’s IBS earth stations exist in the two locations from which Teleport and ASC intend to begin service, New York and Atlanta. It is not clear from the record how firm the applicants’ plans are to expand to other cities, when they would do so, to what cities they would expand, and in which cities ASC earth station facilities currently exist or are under construction.25 According to Comsat’s comments below, thirteen IBS earth stations are currently available and seven more are planned in various cities, but the record does not disclose their location or when they will become operational.26 On the record presented to us, we are unable to evaluate the accuracy of the Commission’s finding that, because “use of the [ASC] National Network would involve facilities already in place, whereas IBS earth stations are not currently authorized for every western U.S. location involved in the TI/ASC proposal,” use of the Intelsat system for some planned service locations “would require the use of terrestrial facilities or the use of a domestic satellite hop.” 1 F.C.C.Rcd. at 104.
Furthermore, it would appear from the fragmentary record that ASC has a network of existing or planned earth stations in a number of U.S. cities, and that Intelsat IBS earth stations also exist or are planned in a comparable number of U.S. cities. While the two networks are partially overlapping, we gather that each has earth stations in some cities where the other has none.27 Thus, either system could provide service without use of terrestrial facilities or additional satellite hops to certain cities but not to others. In a case such as this, it would appear that there is no significant difference between what the applicant has proposed and what Comsat claims to be in a position to offer. A different problem might be posed if the Intelsat network [472]*472were significantly less extensive than the ASC system, or if there were some indication of particular demand for the proposed service in cities where ASC but not Intelsat had earth station facilities. But, at least on the present record, no such circumstances are presented.
We reject a fortiori the Commission’s suggestion that a finding of “uneconomical or impractical” could be based on the fact that use of Intelsat would require ASC to use other carriers’ IBS-compatible earth stations, thus destroying the “context of a total system.” 1 F.C.C.Rcd. at 104. The relevant question under the Buckley Letter is whether the service could be provided via Intelsat — not whether ASC could provide the service via Intelsat. If the FCC means to suggest that the service would be uneconomical or impractical outside the “context of a total system” operated by one carrier, it must point to evidence that Teleport and ASC have adduced to carry their burden of demonstrating this circumstance.28
CONCLUSION
While the FCC correctly considered the Teleport/ASC application under the trans-border policy, it failed to explain adequately its decision that a finding of “uneconomical” could be based solely on comparative price data. Its findings that Intelsat service would be far more expensive and that it would be impractical on other grounds are not supported by “reasoned analysis.” We therefore vacate the Commission’s order granting the Teleport/ASC application and remand for further proceedings consistent with this opinion.
So ordered.