Cite as: 510 U. S. 355 (1994)
Opinion of the Court
the ordinance, April 1, 1988, the Airlines sued the Airport, primarily challenging post-December 31, 1986, rates. The Airlines attacked (1) the Airport's failure to allocate to the concessions a portion of the airfield costs, (2) the surplus generated by the Airport's fee structure, and (3) the Airport's failure to charge general aviation 100% of its allocated airfield costs. These features, the Airlines alleged, made the fees imposed on them unreasonable and thus unlawful under the AHTA, as added, 87 Stat. 90, and as amended, 49 U. S. C. App. § 1513, and the Airport and Airway Improvement Act of 1982 (AAIA), 96 Stat. 686, as amended, 49 U. S. C. App. § 2210. The Airlines also asserted that the Airport's treatment of general aviation discriminates against interstate commerce in favor of primarily local traffic, in violation of the Commerce Clause, U. S. Const., Art. I, § 8, cl. 3.
The parties filed cross-motions for summary judgment. In the first of three opinions, the District Court denied the motions, holding that the Airport's cost methodology is not per se unreasonable. App. to Pet. for Cert. 57. In its second opinion, the District Court held that the Airlines have an implied right of action to challenge the fees under the AHTA but not under the AAIA, and that the Airlines have no cause of action under the Commerce Clause. Id., at 42- 46. Following a bench trial, the District Court issued its third and final opinion, concluding that the challenged fees are not unreasonable under the AHTA. 738 F. Supp. 1112 (WD Mich. 1990).
The Court of Appeals for the Sixth Circuit affirmed the District Court's judgment in principal part. 955 F. 2d 1054 (1992). In accord with the District Court, the Court of Appeals held that the AHTA impliedly confers a private right of action on the Airlines, but the AAIA does not. Id., at 1058. On the merits, the Court of Appeals (1) upheld as reasonable under the AHTA the bulk of the charges that the Airport imposes on the Airlines, and (2) rejected the Air-
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