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Opinion of the Court
lines' dormant Commerce Clause claim on the ground that the AHTA regulates the area. Id., at 1060-1064.
On one matter, however, the Court of Appeals reversed the District Court's judgment and remanded the case. The District Court had upheld as reasonable under the AHTA the Airport's decision to allocate to the Airlines 100% of the costs of providing "crash, fire, and rescue" (CFR) services. 738 F. Supp., at 1119. Emphasizing that the CFR facilities service all aircraft, not just the Airlines, the Court of Appeals held that the Airport must allocate CFR costs between the Airlines and general aviation. 955 F. 2d, at 1062-1063, 1064.
Petitioning for this Court's review, the Airlines challenged the Court of Appeals' adverse rulings on the AHTA and Commerce Clause issues. The Airport did not cross-petition for review of the Sixth Circuit's judgment to the extent that it favored the Airlines; specifically, the Airport did not petition for review of the remand to the District Court for allocation of the costs of CFR services between the Airlines and general aviation. We granted certiorari, 508 U. S. 959 (1993), to resolve a conflict between the decision under review and a decision of the Court of Appeals for the Seventh Circuit, Indianapolis Airport Authority v. American Airlines, Inc., 733 F. 2d 1262 (1984), which declared key parts of a similar fee structure unreasonable under the AHTA.
II
A
In Evansville-Vanderburgh Airport Authority Dist. v. Delta Airlines, Inc., 405 U. S. 707 (1972), this Court held that the Commerce Clause does not prohibit States or municipalities from charging commercial airlines a "head tax" on passengers boarding flights at airports within the jurisdiction, to defray the costs of airport construction and maintenance. We stated in Evansville: "At least so long as the toll is based
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