Arrival or departure reservation.

CFR · 2024-01-01 · US · Title 14

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.

official document · source cfr-2024 · id 14:§ 93.125