BEA, Circuit Judge.
Thai Airways, International (“Thai Airways”) appeals from the district court’s order denying Thai Airways’ motion to dismiss for lack of subject matter jurisdiction pursuant to Fed.R.Civ.P. 12(b)(1). Thai Airways claims the district court erred in refusing to recognize the preclu-sive effect (“res judicata ”) of an earlier order dismissing, under the Foreign Sovereign Immunities Act (“FSIA” or “Act”), 28 U.S.C. §§ 1330, 1602 et seq., an identical action brought by Gupta. That California order of dismissal was not appealed, and is now final. We raised the issue of jurisdiction during oral argument sua sponte and asked the parties to submit briefing on the discrete issue whether this court has jurisdiction to consider the district court’s holding that res judicata does [761]*761not apply in this case. We conclude that we have jurisdiction, and we reverse.
I.
Subir Gupta, Plaintiff-Appellee, was scheduled to fly from Bangkok to Los Angeles. When Gupta attempted to board the plane bound for Los Angeles, Thai Airways employees refused to allow Gupta to board because they determined his United States Visa was invalid. Gupta claims the employees “subjected him to unwarranted accusations of fraud after [he] presented a valid and current U.S. Visa.” Gupta was unable to fly to Los Angeles on this date and claims he missed a lucrative business meeting.
Gupta timely filed a complaint in California Superior Court, Los Angeles County, alleging Thai Airways employees subjected him to unwarranted accusations of fraud regarding his visa that led to professional business losses. Gupta’s complaint alleged claims of (1) negligence; (2) re-spondeat superior liability; (3) negligent hiring, training, and/or retention of unfit employee; (4) intentional infliction of emotional distress; (5) employer’s authorization of employee’s wrongful conduct; (6) slander per se; and (7) intentional interference with contractual relations.
Thai Airways successfully moved to dismiss for lack of subject matter jurisdiction 1 asserting it was a “foreign state” under FSIA, and no exception to the FSIA was applicable.2 The superior court rejected Gupta’s assertion that Thai Airways had implicitly waived its immunity under 28 U.S.C. § 1605(a)(1) by communicating with Gupta regarding Gupta’s suit and by not responding to the service of the com[762]*762plaint. Consequently, the court held Thai Airways immune from suit in United States courts in accordance with 28 U.S.C. § 1604 (“[A] foreign state shall be immune from the jurisdiction of the courts of the United States and of the States.... ”). Gupta did not appeal the state court’s order dismissing the action.3 Rather, Gupta filed a complaint in federal district court in January 2004, alleging identical causes of action as those raised in the dismissed state court complaint.
Thai Airways moved to dismiss Gupta’s federal case pursuant to Federal Rules of Civil Procedure 12(b)(1) and 12(b)(3) forum non conveniens. Regarding Rule 12(b)(1), Thai Airways asserted that the issue of subject matter jurisdiction and immunity under the FSIA was res judica-ta by virtue of the state court’s prior determination of these issues. Thai Airways also argued, without reliance on res judi-cata^ that it was a foreign state and that no exception to the FSIA was applicable.
Gupta responded by asserting that Thai Airways is subject to the jurisdiction of United States courts pursuant to the Warsaw Convention, which governs the international transportation of passengers and cargo. See Convention for the Unification of Certain Rules Relating to International Transportation by Air, Oct. 12, 1929, 49 Stat. 3000, T.S. No. 876 (1934), reprinted in note following 49 U.S.C. § 40105.4 Gupta also argued that the forum was proper because the Warsaw Convention allowed for suit “at the place of destination.”
In ruling on Thai Airways’ motion to dismiss, the district court held that the prior state judgment did not bar re-litigation of the claim in federal court. Nominally applying the preclusion rules of California, the court explained that “a court’s dismissal for lack of jurisdiction is not res judicata as to the merits of the claim because it was not a judgment on the merits.” Because the state court’s order dismissed Gupta’s action for lack of subject matter jurisdiction based on Thai Airways’ immunity under the FSIA, the court held it “was not a judgment on the merits and has no preclusive effect.”
Next the district court held that “[s]uits against foreign states under the Warsaw Convention are excepted from FSIA immunity.” On this basis, the district court then held that the suit against Thai Airways, even though it is a foreign state-owned carrier, was properly brought in United States federal court. The Convention applied to this case, the district court reasoned, because the act of embarking on an international airline flight was sufficient to bring the incident within the ambits of the Convention.
Finally the court explained that the forum was proper because Article 28 of the Warsaw Convention allows for actions [763]*763brought before a court located in the place of the passenger’s destination. Since Gupta was bound for Los Angeles, the district court held that forum is proper in federal district court in California.
Thai Airways now appeals the district court’s order denying its motion to dismiss on grounds of Rule 12(b)(1). Thai Airways argues that Gupta’s action in federal court is barred under principles of res judicata because the state court determined that Thai Airways is immune from suit in the United States on the identical claims asserted in Gupta’s federal complaint.
II.
Because this appeal is from an order denying a motion to dismiss for lack of subject matter jurisdiction — an order which ordinarily is not appealable — we must first determine whether we have jurisdiction to consider Thai Airways’ appeal. See Savage v. Glendale Union High Sch., 343 F.3d 1036, 1040 (9th Cir.2003) (stating that “the denial of a motion to dismiss is ordinarily not a complete and final judgment subject to appeal ... ”). Although the parties did not raise the issue of jurisdiction, we have the obligation to confirm our jurisdiction sua sponte before determining whether the California state court’s holding that Thai Airways is immune from suit under the FSIA is res judicata in federal court. WMX Techs., Inc. v. Miller, 104 F.3d 1133, 1135 (9th Cir.1997) (en banc) (“Although the parties did not raise the question of our jurisdiction, we have raised it sua sponte, as we must.”). We conclude that jurisdiction exists.
The FSIA “is the exclusive source of subject matter jurisdiction over all suits involving foreign states or their instrumentalities.”
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BEA, Circuit Judge.
Thai Airways, International (“Thai Airways”) appeals from the district court’s order denying Thai Airways’ motion to dismiss for lack of subject matter jurisdiction pursuant to Fed.R.Civ.P. 12(b)(1). Thai Airways claims the district court erred in refusing to recognize the preclu-sive effect (“res judicata ”) of an earlier order dismissing, under the Foreign Sovereign Immunities Act (“FSIA” or “Act”), 28 U.S.C. §§ 1330, 1602 et seq., an identical action brought by Gupta. That California order of dismissal was not appealed, and is now final. We raised the issue of jurisdiction during oral argument sua sponte and asked the parties to submit briefing on the discrete issue whether this court has jurisdiction to consider the district court’s holding that res judicata does [761]*761not apply in this case. We conclude that we have jurisdiction, and we reverse.
I.
Subir Gupta, Plaintiff-Appellee, was scheduled to fly from Bangkok to Los Angeles. When Gupta attempted to board the plane bound for Los Angeles, Thai Airways employees refused to allow Gupta to board because they determined his United States Visa was invalid. Gupta claims the employees “subjected him to unwarranted accusations of fraud after [he] presented a valid and current U.S. Visa.” Gupta was unable to fly to Los Angeles on this date and claims he missed a lucrative business meeting.
Gupta timely filed a complaint in California Superior Court, Los Angeles County, alleging Thai Airways employees subjected him to unwarranted accusations of fraud regarding his visa that led to professional business losses. Gupta’s complaint alleged claims of (1) negligence; (2) re-spondeat superior liability; (3) negligent hiring, training, and/or retention of unfit employee; (4) intentional infliction of emotional distress; (5) employer’s authorization of employee’s wrongful conduct; (6) slander per se; and (7) intentional interference with contractual relations.
Thai Airways successfully moved to dismiss for lack of subject matter jurisdiction 1 asserting it was a “foreign state” under FSIA, and no exception to the FSIA was applicable.2 The superior court rejected Gupta’s assertion that Thai Airways had implicitly waived its immunity under 28 U.S.C. § 1605(a)(1) by communicating with Gupta regarding Gupta’s suit and by not responding to the service of the com[762]*762plaint. Consequently, the court held Thai Airways immune from suit in United States courts in accordance with 28 U.S.C. § 1604 (“[A] foreign state shall be immune from the jurisdiction of the courts of the United States and of the States.... ”). Gupta did not appeal the state court’s order dismissing the action.3 Rather, Gupta filed a complaint in federal district court in January 2004, alleging identical causes of action as those raised in the dismissed state court complaint.
Thai Airways moved to dismiss Gupta’s federal case pursuant to Federal Rules of Civil Procedure 12(b)(1) and 12(b)(3) forum non conveniens. Regarding Rule 12(b)(1), Thai Airways asserted that the issue of subject matter jurisdiction and immunity under the FSIA was res judica-ta by virtue of the state court’s prior determination of these issues. Thai Airways also argued, without reliance on res judi-cata^ that it was a foreign state and that no exception to the FSIA was applicable.
Gupta responded by asserting that Thai Airways is subject to the jurisdiction of United States courts pursuant to the Warsaw Convention, which governs the international transportation of passengers and cargo. See Convention for the Unification of Certain Rules Relating to International Transportation by Air, Oct. 12, 1929, 49 Stat. 3000, T.S. No. 876 (1934), reprinted in note following 49 U.S.C. § 40105.4 Gupta also argued that the forum was proper because the Warsaw Convention allowed for suit “at the place of destination.”
In ruling on Thai Airways’ motion to dismiss, the district court held that the prior state judgment did not bar re-litigation of the claim in federal court. Nominally applying the preclusion rules of California, the court explained that “a court’s dismissal for lack of jurisdiction is not res judicata as to the merits of the claim because it was not a judgment on the merits.” Because the state court’s order dismissed Gupta’s action for lack of subject matter jurisdiction based on Thai Airways’ immunity under the FSIA, the court held it “was not a judgment on the merits and has no preclusive effect.”
Next the district court held that “[s]uits against foreign states under the Warsaw Convention are excepted from FSIA immunity.” On this basis, the district court then held that the suit against Thai Airways, even though it is a foreign state-owned carrier, was properly brought in United States federal court. The Convention applied to this case, the district court reasoned, because the act of embarking on an international airline flight was sufficient to bring the incident within the ambits of the Convention.
Finally the court explained that the forum was proper because Article 28 of the Warsaw Convention allows for actions [763]*763brought before a court located in the place of the passenger’s destination. Since Gupta was bound for Los Angeles, the district court held that forum is proper in federal district court in California.
Thai Airways now appeals the district court’s order denying its motion to dismiss on grounds of Rule 12(b)(1). Thai Airways argues that Gupta’s action in federal court is barred under principles of res judicata because the state court determined that Thai Airways is immune from suit in the United States on the identical claims asserted in Gupta’s federal complaint.
II.
Because this appeal is from an order denying a motion to dismiss for lack of subject matter jurisdiction — an order which ordinarily is not appealable — we must first determine whether we have jurisdiction to consider Thai Airways’ appeal. See Savage v. Glendale Union High Sch., 343 F.3d 1036, 1040 (9th Cir.2003) (stating that “the denial of a motion to dismiss is ordinarily not a complete and final judgment subject to appeal ... ”). Although the parties did not raise the issue of jurisdiction, we have the obligation to confirm our jurisdiction sua sponte before determining whether the California state court’s holding that Thai Airways is immune from suit under the FSIA is res judicata in federal court. WMX Techs., Inc. v. Miller, 104 F.3d 1133, 1135 (9th Cir.1997) (en banc) (“Although the parties did not raise the question of our jurisdiction, we have raised it sua sponte, as we must.”). We conclude that jurisdiction exists.
The FSIA “is the exclusive source of subject matter jurisdiction over all suits involving foreign states or their instrumentalities.” Compania Mexicana De Aviacion, S.A. v. U.S. Dist. Ct., 859 F.2d 1354, 1358 (9th Cir.1988) (per cu-riam). Hence, only if one of the Act’s “specified exceptions to sovereign immunity applies” may a court exercise subject matter jurisdiction over a foreign sovereign. Verlinden B.V. v. Cent. Bank of Nigeria, 461 U.S. 480, 489, 103 S.Ct. 1962, 76 L.Ed.2d 81 (1983).5
Because jurisdiction over a foreign sovereign may be exercised only by applicability of an exception to the FSIA, we have long held that “an order denying immunity under the FSIA is appealable under the collateral order doctrine.” Compania Mexicana, 859 F.2d at 1358.6 [764]*764“An interlocutory appeal insures that ‘a foreign state shall be immune from the jurisdiction of the courts of the United States and of the States except as provided [in the Act].’ ” Id. (alteration in the original) (quoting 28 U.S.C. § 1604).7 Accordingly, we have jurisdiction over the order denying Thai Airways’ Rule 12(b)(1) motion.
Thai Airways moved the district court to dismiss Gupta’s action on two grounds: lack of subject matter jurisdiction under Fed.R.Civ.P. 12(b)(1) and forum non con-veniens under Fed.R.Civ.P. 12(b)(3).8 In support of its motion to dismiss under Rule 12(b)(1), Thai Airways briefed two grounds for dismissal in the alternative: (1) the state court’s decision already determined Thai Airways’ immunity under FSIA and, under principles of res judicata, therefore precludes further review of the issue; and (2) Thai Airways is a “foreign state” within the meaning of FSIA, and no FSIA exception is applicable to confer the court jurisdiction. The district court rejected both of Thai Airways’ arguments and issued an order denying Thai Airways’ motion to dismiss for lack of jurisdiction.
It is from this order that Thai Airways is appealing. Under Compañía Mexicana, [765]*765we may review this order denying Thai Airways immunity under the FSIA.9
Ill
A.
The existence of subject matter jurisdiction under the FSIA is a question of law reviewed de novo. See Coyle v. P.T. Garuda Indonesia, 363 F.3d 979, 984 n. 7 (9th Cir.2004); Blaxland, 323 F.3d at 1203.
B.
While the order from which Thai Airways is appealing is one denying its motion to dismiss for lack of subject matter jurisdiction, Thai Airways’ first theory supporting dismissal is that the California state court already determined Thai Airways was immune under FSIA. Thus, Thai Airways contends this determination has preclusive effect in federal court under the principle of res judicata. We agree.
Whether a prior state court judgment precludes relitigation of an identical claim in federal court depends on the preclusion rules of the state. Migra v. Warren City Sch. Dist. Bd. of Educ., 465 U.S. 75, 81, 104 S.Ct. 892, 79 L.Ed.2d 56 (1984); Allen v. McCurry, 449 U.S. 90, 96, 101 S.Ct. 411, 66 L.Ed.2d 308 (1980). This principle results from the statutory command in 28 U.S.C. § 1738 that “judicial proceedings ... shall have the same full faith and credit in every court within the United States and its Territories and Possessions as they have by law or usage in the courts of such State from which they are taken.” “This statute has long been understood to encompass the doctrines of res judicata, or claim preclusion, and collateral estoppel, or issue preclusion.” San Remo Hotel, L.P. v. City and County of San Francisco, Cal., 545 U.S. 323, 336, 125 S.Ct. 2491, 162 L.Ed.2d 315 (2005) (internal quotation marks omitted). Hence, we [766]*766look to California law to determine whether principles of res judicata precluded the district court from deciding anew Thai Airways’ immunity under the FSIA.
Under California law, “ ‘[a]n order denying a motion or dismissing a proceeding for procedural reasons such as lack of jurisdiction is not res judicata as to the merits of any underlying substantive question.’ ” Kalai v. Gray, 109 Cal.App.4th 768, 774, 135 Cal.Rptr.2d 449 (2003) (emphasis added) (quoting Gorman v. Gorman, 90 Cal.App.3d 454, 462, 153 Cal.Rptr. 479 (1979)).10 However, and determinative here, such dismissal does bar re-litigation of “ ‘issues necessary for the determination of jurisdiction.’ ” MIB, Inc. v.Super. Ct., 106 Cal.App.3d 228, 233, 164 Cal.Rptr. 828 (1980) (quoting Nichols v. Canoga Indus., 83 Cal.App.3d 956, 967, 148 Cal.Rptr. 459 (1978)).11 As the California Supreme Court explained, “when the decision on the jurisdictional question is based upon a determination of the merits of an issue before the court, it constitutes a binding determination of that is[767]*767sue.” Shore v. Shore, 43 Cal.2d 677, 681, 277 P.2d 4 (1954).
C.
Here, the California state court concluded it lacked subject matter jurisdiction because Thai Airways is 79% owned by the Ministry of Finance of the Kingdom of Thailand and is therefore immune from suit in courts in the United States under the FSIA. See 28 U.S.C. § 1603(b)(2) (including as a “foreign state” “any entity ... a majority of whose shares or other ownership interest is owned by a foreign state or political subdivision thereof’). The state court further concluded Gupta had not alleged any of the exceptions to the FSIA applied to Thai Airways. These findings were necessary to the determination of jurisdiction and therefore have a preclu-sive effect under Shore, 43 Cal.2d at 681, 277 P.2d 4, and MIB, 106 Cal.App.3d at 231-35,164 Cal.Rptr. 828.12
Under California law, it makes no difference that Gupta now contends the Warsaw Convention provides the court jurisdiction. The California Appellate Court in MIB faced a similar situation where in the fourth action attempting to establish jurisdiction over an out-of-state defendant, the plaintiffs introduced new evidence and pleaded new causes of action. 106 Cal. App.3d at 231, 164 CahRptr. 828. The court held that evidence “which was not introduced in the earlier proceedings” does not overcome the preclusive effect of the prior decisions. Id. at 235, 164 CahRptr. 828. Even if wrong, an earlier decision involving the same issue and the same parties, “is as conclusive as a correct one.” Id. Gupta had a full and fair opportunity to establish the jurisdiction of United States courts over Thai Airways. He failed to do so. He does not now get a do-over.13
Accordingly, we REVERSE and REMAND with instructions to the district court to vacate its order and dismiss Gupta’s suit for lack of jurisdiction.14
REVERSED and REMANDED.