14 C.F.R. § 93.125

Arrival or departure reservation

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Except between 12 Midnight and 6 a.m. local time, no person may operate an aircraft to or from an airport designated as a high density traffic airport unless he has received, for that operation, an arrival or departure reservation from ATC.

[Docket 9974, 37 FR 22794, Oct. 25, 1972]