§ 91.173 ATC clearance and flight plan required.

Official text · Current as of Oct 19, 2026 · from eCFR

No person may operate an aircraft in controlled airspace under IFR unless that person has—

(a) Filed an IFR flight plan; and

(b) Received an appropriate ATC clearance.

← § 91.171 § 91.175 →

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ACE rules page: Part 91 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.