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19 CFR · PART 122
Official text · Current as of Oct 19, 2026 · from eCFR
Once an aircraft has been cleared or given permission to depart it must depart within 72 hours. The aircraft commander or agent shall report promptly to the port director if departure is delayed beyond or cancelled within 72 hours after the aircraft received clearance or permission to depart.
ACE rules page: Part 122 in plain English
Not legal advice. This is the official text as published in the eCFR, which is updated daily but is not the legal edition. For legal purposes, use the annual Code of Federal Regulations or ask an aviation attorney.