DENNIS JACOBS, Chief Judge:

Plaintiffs (indirect purchasers of air freight shipping services) brought suit against numerous foreign airlines ("Defendants"), alleging a conspiracy to fix prices in violation of state antitrust, consumer protection, and unfair competition laws. The United States District Court for the Eastern District of New York (Gleeson, J.) dismissed those claims as expressly preempted by federal law. The Federal Aviation Act preempts state-law claims "related to a price, route, or service of an air carrier." 49 U.S.C. § 41713(b)(1). The question is whether "air carrier" in that provision applies to foreign air carriers. We conclude that it does, and affirm.

BACKGROUND

At least 22 foreign air carriers have been subject to federal criminal charges in the United States in connection with a global price-fixing conspiracy. Some have settled, agreeing to pay fines and penalties totaling almost $2 billion.

Plaintiffs bring this civil suit alleging that they paid excessive prices when Defendants entered into that conspiracy, beginning in 2000, and began levying a number of surcharges, including a fuel surcharge, a war-risk-insurance surcharge, a security surcharge, and a United States customs surcharge. Plaintiffs, as indirect purchasers of air freight shipping, dealt with the defendant airlines through intermediaries, such as freight forwarders. They bring their claims under state law because indirect purchasers are unable to obtain money damages under federal antitrust law. See Ill. Brick Co. v. Illinois, 431 U.S. 720, 729, 97 S.Ct. 2061, 52 L.Ed.2d 707 (1977). Additional claims were brought by other plaintiffs who were direct purchasers. The claims of those direct-purchaser plaintiffs remain in district court and are not before us.

Below, the district court accepted, in relevant part, Magistrate Judge Pohorelsky's recommendation to dismiss Plaintiffs' state claims on the ground that it was expressly preempted by federal law. The district court then entered partial final judgment under Rule 54(b) of the Federal Rules of Civil Procedure, so Plaintiffs could immediately appeal the dismissal decision. This appeal followed.

DISCUSSION

We review de novo a dismissal for failure to state a claim upon which relief can be granted. Harris v. Mills, 572 F.3d 66, 71 (2d Cir.2009). We also review de novo questions of statutory interpretation, Bodansky v. Fifth on the Park Condo, LLC, 635 F.3d 75, 82 (2d Cir.2011), and questions of preemption, New York SMSA Ltd. Partnership v. Town of Clarkstown, 612 F.3d 97, 103 (2d Cir.2010).

The relevant provision of the Federal Aviation Act is as follows:

49 U.S.C. § 41713(b)(1). Plaintiffs' claims undoubtedly arise under state law and are related to "price." Id. The dispositive question, then, is whether foreign air carriers (such as Defendants) are "air carrier[s]" under § 41713(b)(1) (the "preemption provision").

I

We begin "`with the language employed by Congress and the assumption that the ordinary meaning of that language accurately expresses the legislative purpose.'" United States v. Aleynikov, 676 F.3d 71, 76 (2d Cir.2012) (quoting United States v. Albertini, 472 U.S. 675, 680, 105 S.Ct. 2897, 86 L.Ed.2d 536 (1985)). The ordinary, everyday meaning of "air carrier" includes both domestic and foreign air carriers.

That would usually end the analysis, but "[w]hen a statute includes an explicit definition," we generally follow that definition, "even if it varies from that term's ordinary meaning." Stenberg v. Carhart, 530 U.S. 914, 942, 120 S.Ct. 2597, 147 L.Ed.2d 743 (2000). "`Statutory definitions control the meaning of statutory words, of course, in the usual case.'" Nw. Austin Mun. Util. Dist. No. One v. Holder, 557 U.S. 193, 206, 129 S.Ct. 2504, 174 L.Ed.2d 140 (2009) (quoting Lawson v. Suwannee Fruit & S.S. Co., 336 U.S. 198, 201, 69 S.Ct. 503, 93 L.Ed. 611 (1949)). The Federal Aviation Act defines an "air carrier" as "a citizen of the United States undertaking by any means, directly or indirectly, to provide air transportation." 49 U.S.C. § 40102(a)(2). A "foreign air carrier" is separately defined as "a person, not a citizen of the United States, undertaking by any means, directly or indirectly, to provide foreign air transportation." Id. § 40102(a)(21).

Plaintiffs contend that this is the "usual case" where the statutory definitions should control. The statutory definitions are consistent with this Court's authority that the terms "air carrier" and "foreign air carrier" are "mutually exclusive" because an entity cannot be both a citizen and not a citizen of the United States. United States v. Keuylian, 602 F.2d 1033, 1040 (2d Cir.1979). That observation is sound as far as it goes; but there are occasions when statutory definitions yield to context and the development of the statutory wording over time. In any event, while an entity cannot be both an air carrier and a foreign air carrier (i.e., the terms are mutually exclusive), nothing in the statutory definitions prevents the statutory preemption provision from applying to both domestic air carriers and foreign air carriers, which is the matter at issue here.

To demonstrate that Congress has been careful to distinguish between the two terms, Plaintiffs cite 51 places in the Federal Aviation Act where Congress distinguished between an "air carrier" and a "foreign air carrier" by using both terms. At the same time, Plaintiffs concede that there are numerous provisions in the Federal Aviation Act where Congress was not so careful and used the term "air carrier" generically to reference air carriers, both domestic and foreign.1 See In re Korean Air Lines Co. Ltd., Antitrust Litig., 642 F.3d 685, 692 (9th Cir.2011); Port Auth. of N.Y. & N.J. v. Dep't of Transp., 479 F.3d 21, 32 (D.C.Cir.2007).

Since the Federal Aviation Act used the statutory definition in some places, and in other places used the normal, everyday meaning, this is the "unusual case" in which the statutory definitions do not have compulsory application. Nw. Austin Mun. Util. Dist. No. One, 557 U.S. at 206-07, 129 S.Ct. 2504 (internal quotation marks omitted). Because it has been "`established that a statutorily defined term has different meanings in different sections, the term standing alone is necessarily ambiguous and each section must be analyzed to determine whether the context gives the term a further meaning that would resolve the issue in dispute.'" Korean Air Lines, 642 F.3d at 692-93 (brackets omitted) (quoting Robinson v. Shell Oil Co., 519 U.S. 337, 343-44, 117 S.Ct. 843, 136 L.Ed.2d 808 (1997)). To dispel this ambiguity, we look to "other sources, including the legislative history, to discern Congress's meaning." Slayton v. Am. Express Co., 604 F.3d 758, 771 (2d Cir.2010); accord Nw. Austin Mun. Util. Dist. No. One, 557 U.S. at 206-07, 129 S.Ct. 2504; Robinson, 519 U.S. at 343-44, 117 S.Ct. 843; Farmers Reservoir & Irrigation Co. v. McComb, 337 U.S. 755, 764, 69 S.Ct. 1274, 93 L.Ed. 1672 (1949); Lawson, 336 U.S. at 201, 69 S.Ct. 503; see also Philko Aviation, Inc. v. Shacket, 462 U.S. 406, 411, 103 S.Ct. 2476, 76 L.Ed.2d 678 (1983) (refusing to use statutory definition of "conveyance" in the Federal Aviation Act because it would "defeat the primary congressional purpose for" enacting the provision).

Resort to context and legislative history is particularly appropriate in this instance. When the Federal Aviation Act was originally enacted, it "defined `air carrier' as being a U.S. citizen `unless the context otherwise require[d].'" Korean Air Lines, 642 F.3d at 693 n. 5 (emphasis added) (quoting Pub.L. No. 85-726, 72 Stat. 731 (1958)). The proviso was removed in 1994 in an amendment that was intended to make "`no substantive change in the law.'" Id. (quoting S.Rep. No. 103-265, at 5 (1994)); see also Act of July 5, 1994, Pub.L. No. 103-272, § 1, 108 Stat. 745. We therefore consult context and legislative history to ascertain the meaning of "air carrier" in the preemption provision.

II

A review of the Federal Aviation Act, the various amendments to it, and the legislative history and purpose of the preemption provision confirms that the preemption provision should be read to preempt state-law antitrust suits against foreign as well as domestic air carriers. Korean Air Lines, 642 F.3d at 693-95. We start with the preemption provision.

A

The preemption provision was part of the Airline Deregulation Act,2 which amended the Federal Aviation Act to "encourage, develop, and attain an air transportation system which relies on competitive market forces to determine the quality, variety, and price of air services," Pub.L. No. 95-504, (Preamble) 92 Stat. 1705 (1978), while still preserving the significant regulatory authority of the federal Civil Aeronautics Board ("CAB"), see Morales v. Trans World Airlines, Inc., 504 U.S. 374, 379, 112 S.Ct. 2031, 119 L.Ed.2d 157 (1992); see also 49 U.S.C. §§ 1374(b), 1381 (1982) (providing authority for CAB to, inter alia, bar anti-competitive conduct). Previously, the Federal Aviation Act provided that "[n]othing ... in this chapter shall in any way abridge or alter the remedies now existing at common law or by statute, but the provisions of this chapter are in addition to such remedies." 49 U.S.C. § 1506 (1978).

The preemption provision was included in the Airline Deregulation Act "[t]o ensure that the [s]tates would not undo federal deregulation with regulation of their own." Morales, 504 U.S. at 378, 112 S.Ct. 2031; Korean Air Lines, 642 F.3d at 694 ("`In addition to protecting consumers, federal regulation insures a uniform system of regulation and preempts regulation by the states' in a field where state-based variations `would be confusing and burdensome to airline passengers, as well as to the airlines.'") (quoting H.R.Rep. No. 98-793, at 4 (1984), reprinted in 1984 U.S.C.C.A.N. 2857, 2860). This also resolved "uncertainties and conflicts" in the law created by conflicting or overlapping regulations issued by the federal and state governments. H.R.Rep. No. 95-1211 at 16 (1978), reprinted in 1978 U.S.C.C.A.N. 3737, 3751. Accordingly, the preemption provision conferred on the federal government exclusive authority to regulate a carrier's routes, rates, and services. Id. at 16 (explaining that the Airline Deregulation Act "will prevent conflicts and inconsistent regulations by providing that when a carrier operates under authority granted pursuant to ... the Federal Aviation Act, no state may regulate that carrier's routes, rates or services").

The Airline Deregulation Act achieved domestic deregulation, and the original preemption provision applied only to "air carrier[s] having authority ... to provide interstate air transportation." 49 U.S.C. § 1305(a)(1) (1978) (emphasis added). Interstate air transportation is transportation between two states (or the District of Columbia) within the United States. 49 U.S.C. § 1301(24)(a) (1978). Because only domestic air carriers were authorized to engage in "interstate air transportation," 49 U.S.C. § 1301(22) (1978); Korean Air Lines, 642 F.3d at 694, the preemption provision, as originally drafted, was aimed at preemption of state laws and regulations aimed at domestic air carriers, only.

B

The International Air Transportation Competition Act of 1979 ("IATCA"), Pub.L. No. 96-192, 94 Stat. 35 (1980), extended deregulation and the market-oriented regulatory approach of the Airline Deregulation Act to foreign air transportation. Korean Air Lines, 642 F.3d at 694. Although more limited than domestic deregulation, the IATCA was also intended to increase market competition in order to reduce pricing in foreign air transportation. Id. (citing IATCA, § 102(a)(4)).3

C

The Civil Aeronautics Board Sunset Act of 1984 ("Sunset Act"), Pub.L. No. 98-443, 98 Stat. 1703 (1984), included an amendment to the preemption provision that deleted the term "interstate"; so the provision preempted state laws relating to price, route, or service of "`any air carrier having authority ... to provide air transportation.'" See Korean Air Lines, 642 F.3d at 694 (alteration in original) (quoting 49 U.S.C. § 1305(a)(1) (1984)). The Sunset Act conferred upon the United States Department of Transportation the authority to "`preserve the competitive direction adopted in the [Airline Deregulation Act] and the IATCA,'" which makes "clear that the ramifications of the IATCA were in the minds of the Sunset Act's drafters" when they deleted "interstate" from the preemption provision. Korean Air Lines, 642 F.3d at 695 (quoting H.R.Rep. No. 98-793 at 8, reprinted in 1984 U.S.C.C.A.N. at 2864). This legislative history leads to the "conclu[sion] that Congress intended to expand the [Airline Deregulation Act's] preemptive scope to cover state regulation of `foreign air carriers.'" Id. (internal brackets omitted).

The legislative history of the Sunset Act justifies preemption. Although the following text concerns domestic deregulation, the point that is made is just as applicable to foreign air carriers. The House's report explained:

H.R.Rep. No. 98-793 at 4, reprinted in 1984 U.S.C.C.A.N. at 2860. By the same token, the "purpose [of deregulation] would be undermined if states could regulate foreign air carriers." Korean Air Lines, 642 F.3d at 694. Reading the statutory scheme to permit "regulation of foreign air carriers would create a confusing patchwork of regulations for airline passengers to navigate.... Such a result would not be consonant with Congress's express purpose in enacting the statute." Id.

D

Plaintiffs argue that the removal of a single word from the preemption provision — "interstate" — cannot support expansion of the preemption provision to cover foreign air carriers. We disagree. It had been beyond dispute that the preemption provision only applied to domestic air carriers. The Sunset Act, however, was enacted on the heels of the IATCA, which expanded deregulation of the domestic airline industry to foreign air carriers. In light of the clear signals from Congress that deregulation was to continue unabated — and not be frustrated by re-regulation by the states — Congress's removal of "interstate" was intended to expand the preemption bar to state regulation of foreign air carriers.

Since the removal of "interstate" must be given some effect, Plaintiffs propose a congressional intent to expand the preemption provision to domestic air carriers that only had authority to provide overseas air transportation4 and thus were not protected by the wording of the original enactment ("air carrier[s] having authority... to provide interstate air transportation," 49 U.S.C. § 1305(a)(1) (1978)). However, by 1984, that category of domestic air carrier no longer existed. Before 1982, if an air carrier provided overseas — but not interstate — transportation, the CAB would issue an authorizing certificate limited to air transportation overseas. The CAB's authority to issue such certificates expired on December 31, 1981, Airline Deregulation Act of 1978, Publ L. No. 95-504, § 40, 92 stat. 1705, 1744-47; starting January 1, 1982, the CAB issued certificates for domestic air carriers that authorized "interstate and overseas air transportation ... between all points in the United States, its territories and possessions (without regard to point listings)." In re Certificate Formats in 1982, CAB Order No. 81-11-23, at 2 (Nov. 3, 1981); see also Proposals to Provide Essential Air Service at Natchez, Mississippi, CAB Order No. 81-12-132, at 1 (Dec. 22, 1981) (making final the proposed orders and findings set out in the November 3, 1981, Order).

Plaintiffs also argue that deregulation was a domestic initiative; so an expansion of the preemption provision to protect foreign air carriers does not flow from deregulation. However, the IATCA was aimed at foreign air carriers, and the Sunset Act was intended to preserve the pro-competition policy approach of the IATCA as well as the Airline Deregulation Act. See Korean Air Lines, 642 F.3d at 695 (citing H.R.Rep. No. 98-793 at 8, reprinted in 1984 U.S.C.C.A.N. at 2864).

Plaintiffs argue that the IATCA has no bearing on the question before us because it mainly redistributed the administration of federal regulatory authority among federal agencies, and therefore was not deregulatory. This is incorrect. The IATCA (and, later, the Sunset Act) continued the deregulation of the airline industry and expanded deregulation to foreign air carriers. Some regulatory authority that was deemed critical was preserved and transferred from the CAB to the Department of Transportation, Korean Air Lines, 642 F.3d at 694-95 (citing H.R.Rep. No. 98-793, at 2, 8, 13, reprinted in 1984 U.S.C.C.A.N. at 2857, 2858, 2864, 2869), but deregulation is an incremental process, not an annihilation. Maintaining some federal regulatory authority had the not-incidental effect of filling holes for which state regulation was to be excluded. See Korean Air Lines, 642 F.3d at 694.

Finally, Plaintiffs point out that Congress chose to omit from the IATCA any preemption provision specifically for foreign air carriers. That does not matter because we conclude above that Congress achieved that result by other means.5

III

The legislative history of the preemption provision and the amendments to it confirm that Congress intended the term "air carrier" in the preemption provision to mean domestic and foreign air carriers alike. A contrary result would undermine Congress's purpose in enacting the preemption provision and the various deregulation statutes. See Philko Aviation, 462 U.S. at 411, 103 S.Ct. 2476; accord Lawson, 336 U.S. at 201, 69 S.Ct. 503 (rejecting mechanical use of a statutory definition that would "destroy one of the major purposes of" enacting the provision).

The intent of Congress in deregulating the industry and in enacting the preemption provision was "[t]o ensure that the [s]tates would not undo federal deregulation with regulation of their own." Morales, 504 U.S. at 378, 112 S.Ct. 2031. The preemption provision protects air carriers against state regulation relating to prices, routes, and services, 49 U.S.C. § 41713(b)(1); so re-regulation could comprehensively defeat the federal effort to reduce regulation.

Plaintiffs' reading of the preemption provision, which would preempt only state regulation of domestic air carriers, would allow states to regulate the routes, prices, and services of foreign air carriers that operate all over the world. That would risk subjecting foreign air carriers and their customers to "a confusing patchwork" of state-by-state regulation, such as different rules for purchase of otherwise identical international flights if one ticket is from an American air carrier and the other from a foreign carrier. See Korean Air Lines, 642 F.3d at 694 (explaining that, in the context of domestic deregulation, state-by-state re-regulation would subject air carriers and their customers to "state-based variations [which] `would be confusing and burdensome to airline passengers, as well as to the airlines.'" (quoting H.R.Rep. No. 98-793 at 4, reprinted in 1984 U.S.C.C.A.N. at 2860)).

Allowing the states to regulate only foreign air carriers would be particularly peculiar since "[f]oreign commerce is pre-eminently a matter of national concern." Japan Line, Ltd. v. Cnty. of L.A., 441 U.S. 434, 448-49, 99 S.Ct. 1813, 60 L.Ed.2d 336 (1979). Apart from that oddity, a preemption provision that favors domestic air carriers by subjecting only foreign air carriers to state regulation would likely be viewed as "discriminat[ion] against foreign air carriers" in violation of the United States' treaty obligations. Korean Air Lines, 642 F.3d at 696.6 Interpreting the preemption provision in such a manner "offend[s] the long-standing principle that statutes should be construed in accordance with international law." Id. (citing Murray v. Schooner Charming Betsy, 6 U.S. (2 Cranch) 64, 118, 2 L.Ed. 208 (1804)).7

* * *

In sum, the ambiguity of Congress's use of the term "air carrier" in the preemption provision necessitates review of the legislative history of the preemption provision and the various statutes deregulating the airline industry. That legislative history (confirmed by additional canons of statutory construction) leads us to conclude that "air carrier" in the preemption provision means both domestic and foreign air carriers. Plaintiffs' state law claims are therefore expressly preempted, and the district court correctly granted Defendants' motion to dismiss.

Because Plaintiffs' claims are expressly preempted, we need not consider whether they are impliedly preempted.

CONCLUSION

For the foregoing reasons, the judgment of the district court is affirmed.