AMENDED OPINION

Appeal from the United States District Court for the Central District of California.

A coalition of airport users challenged the City of Santa Monica’s airport noise reduction ordinances in the district court. They appeal from the resulting judgment which denied most of the relief they were seeking.

After an increase in the use of jet aircraft and helicopters, the City of Santa Monica enacted several ordinances to reduce noise at the city-owned and operated airport. Section 10101 imposed a night curfew on takeoffs and landings; § 10111C prohibited certain low aircraft approaches on weekends; § 10105A2 prohibited helicopter flight training; § 10105B established a maximum single event noise exposure level (SENEL) of 100 dB. 1 ; § 10105A1 prohibited jets at the airport and § 10105E provided a fine for any jet landings or takeoffs.

Appellants asserted the invalidity, on various grounds, of all of the above regulations. In a well-reasoned opinion, the district court found that the ordinances: (1) were not preempted by federal law; (2) did not violate grant agreements between the FAA and Santa Monica or breach any airport lease; (3) did not violate the Federal Aviation Act; and (4) that the first four ordinances did not violate the Equal Protection or Commerce Clauses. The district court did find, however, that the categorical ban on all jet aircraft and the penalty statute violated the Equal Protection and Commerce Clauses. We affirm.

Appellants contend that the ordinances in question are preempted by the comprehensive nature of federal control of civil aviation, and cite City of Burbank v. Lockheed Air Terminal, 411 U.S. 624 , 93 S.Ct. 1854 , 36 L.Ed.2d 547 (1973). In that case, the Supreme Court struck down on preemption grounds Burbank’s jet curfew *103 ordinance as an unauthorized extension of state police power into the federal domain. But in doing so, the court expressly left open the question of “what limits, if any, apply to a municipality as a proprietor . . . . ” should it decide to enact similar ordinances. 411 U.S. at 635 -36 n.14, 93 S.Ct. at 1860 -61 n.14. 2 The caveat may have been thought necessary in view of the Court’s earlier decision in Griggs v. Allegheny County, 369 U.S. 84 , 82 S.Ct. 531 , 7 L.Ed.2d 585 , reh. denied, 369 U.S. 857 , 82 S.Ct. 931 , 8 L.Ed.2d 16 (1962), which held municipal airport owners liable for Fifth Amendment “takings” of private property resulting from unreasonable airport use with respect to neighboring lands. Municipal airport owners needed some means of limiting their liability under Griggs . Environmental quality control ordinances by municipal airport proprietors are among those means.

Appellants argue that Burbank’s footnote 14 did not endorse and should not be relied upon to create a municipal-proprietor exemption from federal preemption. They contend that a municipal-proprietor exemption would render Burbank meaningless. 3 Their argument, while overstated, has some superficial appeal. Nevertheless, the argument is not persuasive.

The Supreme Court in Burbank instructed us to “ ‘start with the assumption that the historic police powers of the states were not to be superseded by the Federal Act unless that was the clear and manifest purpose of Congress.’ ” 411 U.S. at 633 , 93 S.Ct. at 1859 , quoting from Rice v. Santa Fe Elevator Corp., 331 U.S. 218, 230 , 67 S.Ct. 1146, 1152 , 91 L.Ed. 1447 (1947).

The Second Circuit in British Airways Bd. v. Port Authority of New York, 558 F.2d 75 (2nd Cir.), on remand, 437 F.Supp. 804 , mod., 564 F.2d 1002 (1977), and the district court in National Aviation v. City of Hayward, Cal., 418 F.Supp. 417 (N.D.Cal.1976), marshall impressive excerpts from the legislative history of the Federal Aviation Acts which show that, in light of Griggs , Congress was not preempting a municipal airport proprietor’s right to enact noise ordi *104 nances. See 558 F.2d at 83-84, 418 F.Supp. at 420-422 . 4 Bat see San Diego Etc. v. Super. Ct. for Cty. of San Diego, 67 Cal.App.3d 361, 367 , 136 Cal.Rptr. 557, 561 (4th Dist.), cert. denied, 434 U.S. 859 , 98 S.Ct. 184 , 54 L.Ed.2d 132 (1977). Because Congressional intent not to preempt all regulation by municipal-proprietors is clear, the district court correctly concluded that these ordinances were not preempted. 5

Appellants make two additional preemption arguments. They argue that even if there is a municipal proprietor exception for noise regulations, the 100 dB SENEL regulation is preempted. 6 First, they contend that Santa Monica’s SENEL regulation is invalid because it frustrates the United States’ exclusive control over aircraft flight and management. They argue that because this SENEL measures and limits the noise created by planes taking off and landing, it is preempted by federal supremacy.

The district court rejected this argument. It concluded that SENEL was not a regulation of airspace or aircraft in flight, but instead a reasonable regulation by an airport proprietor of noise made by aircraft. The court said:

We agree.

We have held that the power of a municipal proprietor to regulate the use of its airport is not preempted by federal legislation. We further hold that the municipal proprietor exception allows the City to choose the SENEL method involved here, despite the SENEL’s monitoring of noise created by planes as they are ascending or descending.

The legislative history shows that Congress intended that municipal proprietors enact reasonable regulations to establish acceptable noise levels for airfields and their environs. See, e. g., British Airways Bd. v. Port Authority of New York, 558 F.2d 75 , 84-85 (2nd Cir. 1977) (and authorities cited therein). The legislative history does not suggest that Congress intended only to allow municipalities the option of excluding certain classes of aircraft. See National Aviation v. City of Hayward, Cal., 418 F.Supp. 417, 421-24 (N.D.Cal.1976) (upholding a 112 dB SENEL ordinance by a municipal proprietor); British Airways, supra, 558 F.2d at 83-84; S.Rep. No. 92-1160, 92nd Cong., 2d Sess. (1972) (reprinted in (1972) U.S. Code Cong. & Ad. News 4655; 5. Rep. No. 1353, 90th Cong., 2d Sess. (1968) (reprinted in (1968) U.S. Code Cong. & Ad. News 2688, 2694). The reasonable inference, not contradicted by the legislative history, is that Congress intended to allow a *105 municipality flexibility in fashioning its noise regulations. See Hayward, supra, 418 F.Supp. at 425, n.13 .

There was evidence that the City’s SEN-EL system was one of the most direct, effective and least costly methods of monitoring and regulating noise. This SENEL regulates that noise for which the City is liable. Thus, we hold that in this instance, the SENEL method used by the City does not render its otherwise proper noise regulations unlawful.

The appellants have also argued that “preemption as applied” invalidates the 100 dB SENEL ordinance. The district court summarized this claim as follows:

The district court rejected this argument. It noted that the SENEL ordinance did not regulate airspace or flight. It reasoned that the tendency to violate a certain law does not render the law improper or illegal. These arguments are sound. Appellants have cited no authority which convinces us that the district court was incorrect. The principles of comity and federalism militate against our invalidating a state or local regulation unless it is written in unlawful terms, or because, on its face, it is preempted. We have no warrant to strike down an ordinance merely because the public reacts to it in a manner inconsistent with federal law.

Accordingly, we reject the “preemption as applied” argument.

Other points briefed and argued by the parties were fully and correctly answered in the district court’s opinion. 7

Affirmed.

. dB is an abbreviation for decibels, a noise measurement.

. In footnote 14, the Court said:

. In Burbank, the City of Burbank did not own the airport. Appellants claim that these peculiar ownership circumstances would limit Burbank merely to its special facts should we hold that ordinances enacted by municipal owners are not preempted by federal law. We do not think so. The impact of our holding will probably be less than appellants suggest. Burbank will continue to prohibit adjacent cities from trying to control noise at airports they do not own. See, e. g., Allegheny Airlines v. Village of Cedarhurst, 238 F.2d 812 (2nd Cir. 1956) (Cedarhurst preempted from passing noise ordinances regarding flights into New York City’s airport); American Airlines, Inc. v. City of Audubon Park, 297 F.Supp. 207 (W.D.Ky.1968), aff’d. 407 F.2d 1306 (6th Cir.), cert. denied, 396 U.S. 845 , 90 S.Ct. 78 , 24 L.Ed.2d 95 (1969) (Audubon Park preempted from passing ordinance regulating noise at Louisville’s airport); American Airlines, Inc. v. Town of Hempstead, 272 F.Supp. 226 (E.D.N.Y.1967), aff’d. 398 F.2d 369 (2nd Cir. 1968), cert. denied, 393 U.S. 1017 , 89 S.Ct. 620 , 21 L.Ed.2d 561 (1969), (Hemp-stead preempted from passing ordinances affecting noise at New York City’s airport).

. Plaintiffs respond to this legislative history argument by saying that this argument was made to the Burbank court and rejected. This response is not accurate. The Supreme Court expressly reserved the question as to municipal proprietors. Burbank, 411 U.S. 635 -36, n.14, 93 S.Ct. 1860 -61, n.14.

. Plaintiffs also argue that even if Griggs is used to justify a municipal-proprietor exemption to preemption, that exception should be limited to ordinances necessary to avoid Griggs liability. The problem with this argument is that it assumes that Griggs liability is limited to Fifth Amendment takings. Nothing in Griggs indicates such a limitation. Liability may well be imposed upon a municipality on theories other than inverse condemnation. The City of Santa Monica should be allowed to define the threshold of its liability, and to enact noise ordinances under the municipal-proprietor exemption if it has a rational belief that the ordinance will reduce the possibility of liability or enhance the quality of the city’s human environment.

. During the course of this litigation, Santa Monica amended its SENEL ordinance to prohibit noise in excess of 85 dB. (Santa Monica is considering reenacting the 100 dB ordinance, however.)

On rehearing, it was urged that the preemption arguments apply and must be addressed, regardless of which SENEL ordinance applies. Accordingly, we examined the merits of the 100 dB SENEL preemption arguments even though the final text of the ordinance is not settled. See Brockington v. Rhodes, 396 U.S. 41 , 90 S.Ct. 206 , 24 L.Ed.2d 209 (1969) (per curiam).

. 481 F.Supp. 927 (C.D.Cal.1979).