TASHIMA, District Judge:
Appellant (plaintiff) Independent Union of Flight Attendants (IUFA) brought this action to enforce an arbitration provision in its collective bargaining agreement (CBA) with appellees (defendants) Pan American World Airways, Inc. (Pan Am), and Pan Am Corporation. That agreement, effective June 4, 1986, provided that Pan Am would use IUFA flight attendants on the Pan Am Flight Service System Seniority List for all present or future flying. By a letter agreement, this scope clause was made equally applicable to the operations of the parent, Pan Am Corp. Pan Am has used IUFA flight attendants on intra-Euro-pean routes for at least 13 years and has entered into other agreements under the Railway Labor Act (RLA) for such all-foreign routes with pilots and other flight attendants’ unions.
In November 1987, Pan American Express, Inc., a subsidiary of Pan Am Corp., began offering intra-European service from a base in Berlin (“Berlin Express”). None of these flights take off from or land in, or overfly, any state, territory, or possession of the United States. Berlin Express chose to operate with foreign national flight attendants represented by a German union. On January 6, 1988, IUFA filed a grievance alleging that defendants’ failure to use IUFA flight attendants constituted a violation of the scope clause of the CBA. Pan Am denied the grievance on February 9, 1988, on the ground that the issue was not one of contract interpretation but a representational dispute over which the arbitral body provided for in the contract has no jurisdiction.
On defendants’ motion, the district court dismissed the action for lack of subject matter jurisdiction on the ground that the RLA does not apply extraterritorially. Plaintiff appealed1 and we affirm.
ISSUE
The sole issue on appeal is whether or not the district court had subject matter jurisdiction of this action.2
DISCUSSION
Plaintiff seeks to establish subject matter jurisdiction on the ground that this action “arises under” the RLA. 45 U.S.C. §§ 151 et seq. & 181 et seq.; 28 U.S.C. §§ 1331 & 1337. Section 204 of the RLA, 45 U.S.C. § 184 (1982), requires contracting parties to establish system boards of adjustment to resolve “minor disputes”3 through arbitration. An action arises under federal law if either: (1) a federal statute creates the claim; or (2) a substantial question of federal law is a necessary element of the claim. E.g., Morongo Band of Mission Indians v. California State Bd. of Equalization, 858 F.2d 1376, 1383 (9th Cir.1988), cert. denied, 488 U.S. 1006, 109 S.Ct. 787,. 102 L.Ed.2d 779 (1989).
Federal district courts have “arising under” jurisdiction to enforce' such required arbitration provisions in contracts entered into under the RLA. International Ass’n of Machinists v. Central Airlines, 372 U.S. 682, 692, 83 S.Ct. 956, 962, 10 L.Ed.2d 67 (1963). Defendants argue, however, that their obligation to arbitrate this dispute cannot be enforced in federal court because [680]*680the RLA does not extend to purely foreign flying. We first determine the scope of the RLA, and then consider whether the provision may be enforced in federal court.4
A. The Territorial Scope of the RLA
1. The presumption against extraterritoriality
The RLA does not expressly encompass or exclude purely foreign flying. On the “assumption that Congress is primarily concerned with domestic conditions,” Foley Bros. v. Filardo, 336 U.S. 281, 285, 69 S.Ct. 575, 577, 93 L.Ed. 680 (1949), the Supreme Court has applied a presumption against extraterritoriality to federal statutes.
The canon of construction which teaches that legislation of Congress, unless a contrary intent appears, is meant to apply only within the territorial jurisdiction of the United States, is a valid approach whereby unexpressed congressional intent may be ascertained.
Id.; see also Argentine Republic v. Amer-ada Hess Shipping Corp., 488 U.S. 428, 109 S.Ct. 683, 691, 102 L.Ed.2d 818 (1989) (limiting Foreign Sovereign Immunities Act (FSIA), 28 U.S.C. § 1603(c), “waters” to within 3-mile territorial sea); Grunfeder v. Heckler, 748 F.2d 503, 509 (9th Cir.1984) (en banc) (German reparation payments not intended to affect SSI eligibility); McKeel v. Islamic Republic of Iran, 722 F.2d 582, 589 (9th Cir.1983) (limiting FSIA to territorial jurisdiction), cert, denied, 469 U.S. 880, 105 S.Ct. 243, 83 L.Ed.2d 182 (1984). In Foley Bros., the Court held that the “Eight Hour Act” did not apply extraterritorially, since “nothing in the Act itself.... nor in the legislative history ... [led] to the belief that Congress entertained any intention other than the normal one.” 336 U.S. at 285, 69 S.Ct. at 577.
This presumption has been attributed to the risk of “outright collisions between domestic and foreign law” which are “a po[681]*681tential source of friction between the United States and foreign countries....” Pfeiffer v. Wm. Wrigley Jr. Co., 755 F.2d 554, 557 (7th Cir.1985) (denying extraterritorial effect to the Age Discrimination in Employment Act [ADEA] ).5 It has also been attributed to the deference of courts to Congress. “It alone has the facilities necessary to make fairly such an important policy decision_” Benz v. Compania Naviera Hidalgo, S.A., 353 U.S. 138, 147, 77 S.Ct. 699, 704, 1 L.Ed.2d 709 (1957) (denying extraterritorial effect to the NLRA).
This presumption creates a high threshold. In Benz, the Court considered whether the striking crew of a foreign vessel could invoke the protection of the Labor Management Relations Act (LMRA) while in United States waters. In denying extraterritorial effect to the Act, the Court held that “to run interference in such a delicate field of international relations there must be present the affirmative intention of the Congress clearly expressed.” Id.; see also McCulloch v. Sociedad Nacional de Marineros de Honduras, 372 U.S. 10, 21-22, 83 S.Ct. 671, 677-78, 9 L.Ed.2d 547 (1963) (absent affirmative congressional intent, court cannot exercise jurisdiction despite preponderance of contacts with United States).6 In Foley Bros., the Court rea[682]
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TASHIMA, District Judge:
Appellant (plaintiff) Independent Union of Flight Attendants (IUFA) brought this action to enforce an arbitration provision in its collective bargaining agreement (CBA) with appellees (defendants) Pan American World Airways, Inc. (Pan Am), and Pan Am Corporation. That agreement, effective June 4, 1986, provided that Pan Am would use IUFA flight attendants on the Pan Am Flight Service System Seniority List for all present or future flying. By a letter agreement, this scope clause was made equally applicable to the operations of the parent, Pan Am Corp. Pan Am has used IUFA flight attendants on intra-Euro-pean routes for at least 13 years and has entered into other agreements under the Railway Labor Act (RLA) for such all-foreign routes with pilots and other flight attendants’ unions.
In November 1987, Pan American Express, Inc., a subsidiary of Pan Am Corp., began offering intra-European service from a base in Berlin (“Berlin Express”). None of these flights take off from or land in, or overfly, any state, territory, or possession of the United States. Berlin Express chose to operate with foreign national flight attendants represented by a German union. On January 6, 1988, IUFA filed a grievance alleging that defendants’ failure to use IUFA flight attendants constituted a violation of the scope clause of the CBA. Pan Am denied the grievance on February 9, 1988, on the ground that the issue was not one of contract interpretation but a representational dispute over which the arbitral body provided for in the contract has no jurisdiction.
On defendants’ motion, the district court dismissed the action for lack of subject matter jurisdiction on the ground that the RLA does not apply extraterritorially. Plaintiff appealed1 and we affirm.
ISSUE
The sole issue on appeal is whether or not the district court had subject matter jurisdiction of this action.2
DISCUSSION
Plaintiff seeks to establish subject matter jurisdiction on the ground that this action “arises under” the RLA. 45 U.S.C. §§ 151 et seq. & 181 et seq.; 28 U.S.C. §§ 1331 & 1337. Section 204 of the RLA, 45 U.S.C. § 184 (1982), requires contracting parties to establish system boards of adjustment to resolve “minor disputes”3 through arbitration. An action arises under federal law if either: (1) a federal statute creates the claim; or (2) a substantial question of federal law is a necessary element of the claim. E.g., Morongo Band of Mission Indians v. California State Bd. of Equalization, 858 F.2d 1376, 1383 (9th Cir.1988), cert. denied, 488 U.S. 1006, 109 S.Ct. 787,. 102 L.Ed.2d 779 (1989).
Federal district courts have “arising under” jurisdiction to enforce' such required arbitration provisions in contracts entered into under the RLA. International Ass’n of Machinists v. Central Airlines, 372 U.S. 682, 692, 83 S.Ct. 956, 962, 10 L.Ed.2d 67 (1963). Defendants argue, however, that their obligation to arbitrate this dispute cannot be enforced in federal court because [680]*680the RLA does not extend to purely foreign flying. We first determine the scope of the RLA, and then consider whether the provision may be enforced in federal court.4
A. The Territorial Scope of the RLA
1. The presumption against extraterritoriality
The RLA does not expressly encompass or exclude purely foreign flying. On the “assumption that Congress is primarily concerned with domestic conditions,” Foley Bros. v. Filardo, 336 U.S. 281, 285, 69 S.Ct. 575, 577, 93 L.Ed. 680 (1949), the Supreme Court has applied a presumption against extraterritoriality to federal statutes.
The canon of construction which teaches that legislation of Congress, unless a contrary intent appears, is meant to apply only within the territorial jurisdiction of the United States, is a valid approach whereby unexpressed congressional intent may be ascertained.
Id.; see also Argentine Republic v. Amer-ada Hess Shipping Corp., 488 U.S. 428, 109 S.Ct. 683, 691, 102 L.Ed.2d 818 (1989) (limiting Foreign Sovereign Immunities Act (FSIA), 28 U.S.C. § 1603(c), “waters” to within 3-mile territorial sea); Grunfeder v. Heckler, 748 F.2d 503, 509 (9th Cir.1984) (en banc) (German reparation payments not intended to affect SSI eligibility); McKeel v. Islamic Republic of Iran, 722 F.2d 582, 589 (9th Cir.1983) (limiting FSIA to territorial jurisdiction), cert, denied, 469 U.S. 880, 105 S.Ct. 243, 83 L.Ed.2d 182 (1984). In Foley Bros., the Court held that the “Eight Hour Act” did not apply extraterritorially, since “nothing in the Act itself.... nor in the legislative history ... [led] to the belief that Congress entertained any intention other than the normal one.” 336 U.S. at 285, 69 S.Ct. at 577.
This presumption has been attributed to the risk of “outright collisions between domestic and foreign law” which are “a po[681]*681tential source of friction between the United States and foreign countries....” Pfeiffer v. Wm. Wrigley Jr. Co., 755 F.2d 554, 557 (7th Cir.1985) (denying extraterritorial effect to the Age Discrimination in Employment Act [ADEA] ).5 It has also been attributed to the deference of courts to Congress. “It alone has the facilities necessary to make fairly such an important policy decision_” Benz v. Compania Naviera Hidalgo, S.A., 353 U.S. 138, 147, 77 S.Ct. 699, 704, 1 L.Ed.2d 709 (1957) (denying extraterritorial effect to the NLRA).
This presumption creates a high threshold. In Benz, the Court considered whether the striking crew of a foreign vessel could invoke the protection of the Labor Management Relations Act (LMRA) while in United States waters. In denying extraterritorial effect to the Act, the Court held that “to run interference in such a delicate field of international relations there must be present the affirmative intention of the Congress clearly expressed.” Id.; see also McCulloch v. Sociedad Nacional de Marineros de Honduras, 372 U.S. 10, 21-22, 83 S.Ct. 671, 677-78, 9 L.Ed.2d 547 (1963) (absent affirmative congressional intent, court cannot exercise jurisdiction despite preponderance of contacts with United States).6 In Foley Bros., the Court rea[682]*682soned that Congress would not ordinarily apply domestic wage and hour provisions to aliens working abroad on United States public works projects and that the absence of a distinction in the Act between citizens and aliens was strong evidence of congressional intent not to do so. 336 U.S. at 286, 69 S.Ct. at 578. “An intention so to regulate labor conditions which are the primary concern of a foreign country should not be attributed to Congress in the absence of a clearly expressed purpose.” Id.
Most courts of appeals have consistently required such a “clear expression” of congressional intent to apply legislation extra-territorially. E.g., CFTC v. Nahas, 738 F.2d 487, 493 n. 12 (D.C.Cir.1984) (clear evidence or unambiguous expression lacking; service of process statute not applied extraterritorially); Cleary v. United States Lines, Inc., 728 F.2d 607, 610 (3d Cir.1984) (affirmative evidence lacking; ADEA not applied extraterritorially); United States v. Mitchell, 553 F.2d 996, 1002 (5th Cir.1977) (denying extraterritorial effect to the Marine Mammal Protection Act). The Fifth Circuit applied this heightened standard in concluding that Congress did not intend extraterritorial application of Title VII of the Civil Rights Act of 1964. Boureslan v. ARAMCO, 857 F.2d 1014 (5th Cir.1988), aff'd en banc, 892 F.2d 1271 (5th Cir.1989), cert. granted, — U.S.-, 111 S.Ct. 40, 112 L.Ed.2d 17 (1990).
2. Interpretation of the RLA
The RLA does not expressly except purely foreign flying from its coverage. Nonetheless, virtually every court to consider the question has concluded that Congress did not intend the RLA to govern labor disputes in other countries. E.g., Air Line Dispatchers Ass’n v. National Mediation Bd., 189 F.2d 685, 690-91 (D.C.Cir.) (union applied to NMB to resolve representation dispute involving foreign dispatchers), cert. denied, 342 U.S. 849, 72 S.Ct. 77, 96 L.Ed. 641 (1951); Air Line Stewards & Stewardesses Ass’n v. Northwest Airlines, 267 F.2d 170 (8th Cir.) (union sued to overturn arbitration award precluding union representation of foreign national flight attendants on foreign flights), cert. denied, 361 U.S. 901, 80 S.Ct. 208, 4 L.Ed.2d 156 (1959); Air Line Stewards & Stewardesses Ass’n v. Trans World Airlines, 273 F.2d 69 (2d Cir.1959) (per curiam) (action to compel TWA to bargain with union on behalf of foreign flight attendants on foreign flights), cert. denied, 362 U.S. 988, 80 S.Ct. 1075, 4 L.Ed.2d 1021 (1960). None of these cases, however, concerned an attempt to enforce an agreement already entered into by the parties.7.
Our starting point in analyzing the scope of the RLA is its definition of “commerce.” The RLA was amended to cover common carriers by air in 1936. Act of April 10, 1936, ch. 166, 49 Stat. 1189 (codified at 45 U.S.C. §§ 181, et seq.). Except for the omission of a national board of adjustment, Congress simply “extended to ... every common carrier by air engaged in interstate or foreign commerce” those provisions relating to carriers by rail. 45 U.S.C. § 181 (1982) (referring to 45 U.S.C. §§ 151-163). At the time of the amendment, a [683]*683“carrier” for purposes of the RLA was one subject to the Interstate Commerce Act (ICA). 45 U.S.C. § 151, First (1982). The ICA had been amended in 1920 to further circumscribe its territorial reach: the Act applied to transportation of persons or goods, or transmission of intelligence,
[f]rom one State or Territory of the United States, or the District of Columbia, to any other State or .Territory of the United States or the District of Columbia, or from one place in a Territory to another place in the same Territory, or from any place in the United States through a foreign country to any other place in the United States, or from or to any place in the United States to .or from a foreign country, but only in so far as such transportation or transmission takes place within the United States.
Transportation Act, 1920, § 400(1), ch. 91, 41 Stat. 474 (originally codified at 49 U.S.C. § 1(1)) (emphasis added). Most courts have concluded that Congress intended these limitations to apply to carriers by air as well. E.g., Air Line Dispatchers Ass’n, 189 F.2d at 690; Northwest Airlines, 267 F.2d at 173; Trans World Airlines, 273 F.2d at 71.
Congress also had amended the ICA to include definitions of “air commerce” and “interstate and foreign air commerce.” Such commerce embraced transportation of passengers or property
between any State, Territory, or possession, or the District of Columbia, and any place outside thereof; or between points within the same State, Territory, or possession, or the District of Columbia, and any point within the same State, Territory, or possession, or the District of Columbia, but through the airspace over any place outside thereof; or wholly within the airspace over any Territory or possession or the District of Columbia.
Air Commerce Act of 1926, § 1, ch. 344, 44 Stat. 568 (1926) (codified at 49 U.S.C. § 171, repealed and reenacted with amendments at 49 U.S.C.App. §§ 1301(4), (20)).8 While this language is less limiting than that pertaining to rail carriers, it does not include purely foreign flying. Cf. Cheng v. Boeing Co., 708 F.2d at 1412 (Federal Aviation Act inapplicable to foreign flying; therefore, court lacked federal question jurisdiction as to foreign defendant in wrongful death actions).
One searches the RLA and ICA in vain for any expression of congressional intent that the. RLA applies to purely foreign flying. The presumption against extraterritoriality, in conjunction with Congress’ careful and thorough definitions of commerce, compels the conclusion that the RLA does not prescribe substantive law with respect to flights which are not within its definitions of commerce.9
B. Federal Enforceability of Contract Regulating Foreign Flying
While a contract between private parties ordinarily does not provide a basis for federal question jurisdiction, the Supreme Court has concluded that a contract entered into under the RLA “is a federal contract and is therefore governed and enforceable by federal law, in the federal courts.” Central Airlines, 372 U.S. at 692, 83 S.Ct. at 962. The breadth of this holding, however, does not exceed that of the rationale on which it rests. The Court read § 204 of the RLA to impose on the parties a duty to establish boards of adjustment. Id. at 690, 83 S.Ct. at 961 (likening this duty to the duties to bargain and of fair representation). The substantial question arising under federal law therefore was “whether the contractual arrangements made by the parties are sufficient to discharge the mandate of § 204 and are consistent with the Act and its purposes.” Id. at 691, 83 S.Ct. at 961. Concern for compliance with the statutory mandate need not and should not extend beyond the scope of that mandate itself. Since, as we [684]*684have seen, the RLA does not apply to purely foreign flying, no substantial question of federal law appears to be raised by an action to enforce an arbitration agreement with respect to such flying.
The parties’ voluntary extension of RLA policies and procedures to purely foreign flying does not alter this conclusion. Cf. Morongo Band of Mission Indians, 858 F.2d at 1385-86 (breach of contract is a state law claim, although contract is entered into under the authority of (but not compelled by) federal law). An argument can be made that, as a matter of contract law, since the relevant terms do not differentiate on the basis of location, those terms have the same meaning and are enforceable to the same extent when applied to purely foreign flying as to flying covered by the RLA. It would follow that any interpretation of those terms raises a federal question because, regardless of location, the same issue is determined; that is, an interpretation with respect to purely foreign flying also constitutes an interpretation with respect to all other flying, and vice versa. Such an approach is consistent with the Supreme Court’s observation that “[t]he needs of the subject matter manifestly call for uniformity.” Central Airlines, 372 U.S. at 691-92, 83 S.Ct. at 961-62. Congress, however, did not seek to impose uniformity of interpretation beyond the boundaries of the RLA. Nor need courts assume jurisdiction of cases involving purely foreign flying to effectuate the purposes of the RLA; compliance with the statute can be fully assured by enforcing it in cases falling within the RLA’s geographic scope.10
CONCLUSION
The judgment of the district court is AFFIRMED.