380
Opinion of the Court
litigation over this issue will not be necessary and that airlines will discontinue the practice . . . immediately." Memorandum from Attorneys General of Colorado, Kansas, Massachusetts, Missouri, New York, Texas, and Wisconsin, dated February 3, 1988 (Exhibit A to Exhibit H to Motion for Temporary Restraining Order), App. 123a, 125a. Several months later, petitioner's office sent letters to several respondents serving "as formal notice[s] of intent to sue." Letter from Assistant Attorney General of Texas, dated November 14, 1988, App. 115a.
Those respondents then filed suit in Federal District Court claiming that state regulation of fare advertisements is preempted by § 1305(a)(1); seeking a declaratory judgment that, inter alia, § 2.5 of the guidelines is pre-empted; and requesting an injunction restraining Texas from taking any action under its law in conjunction with the guidelines that would regulate respondents' rates, routes, or services, or their advertising and marketing of the same. The District Court entered a preliminary injunction to that effect, determining that respondents were likely to prevail on their pre-emption claim. Trans World Airlines, Inc. v. Mattox, 712 F. Supp. 99, 101-102 (WD Tex. 1989). (It subsequently extended that injunction to 33 other States, id., at 105-106; the propriety of that extension is not before us.) The Court of Appeals affirmed. Trans World Airlines, Inc. v. Mattox, 897 F. 2d 773, 783-784 (CA5 1990). Subsequently, the District Court, in an unreported order, permanently enjoined the States from taking "any enforcement action" which would restrict "any aspect" of respondents' fare advertising or operations relating to rates, routes, or services. The Court of Appeals once again affirmed. 949 F. 2d 141 (CA5 1991). We granted certiorari. 502 U. S. 976 (1991).
II
Before discussing whether § 1305(a)(1) pre-empts state enforcement of the challenged guidelines, we first consider
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