Cite as: 505 U. S. 672 (1992)
Opinion of the Court
ing the operators' objections belies any such claim. See n. 2, supra. In short, there can be no argument that society's time-tested judgment, expressed through acquiescence in a continuing practice, has resolved the issue in petitioners' favor.
Petitioners attempt to circumvent the history and practice governing airport activity by pointing our attention to the variety of speech activity that they claim historically occurred at various "transportation nodes" such as rail stations, bus stations, wharves, and Ellis Island. Even if we were inclined to accept petitioners' historical account describing speech activity at these locations, an account respondent contests, we think that such evidence is of little import for two reasons. First, much of the evidence is irrelevant to public fora analysis, because sites such as bus and rail terminals traditionally have had private ownership. See United Transportation Union v. Long Island R. Co., 455 U. S. 678, 687 (1982); H. Grant & C. Bohi, The Country Railroad Station in America 11-15 (1978); U. S. Dept. of Transportation, The Intercity Bus Terminal Study 31 (Dec. 1984). The development of privately owned parks that ban speech activity would not change the public fora status of publicly held parks. But the reverse is also true. The practices of privately held transportation centers do not bear on the government's regulatory authority over a publicly owned airport.
Second, the relevant unit for our inquiry is an airport, not "transportation nodes" generally. When new methods of transportation develop, new methods for accommodating that transportation are also likely to be needed. And with each new step, it therefore will be a new inquiry whether the transportation necessities are compatible with various kinds of expressive activity. To make a category of "transportation nodes," therefore, would unjustifiably elide what may prove to be critical differences of which we should rightfully take account. The "security magnet," for example, is
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