14 CFR 91.173 — ATC clearance and flight plan required.

eCFR 2026-07-09 public domain

Official text: ecfr.gov →

Cited by 2 AF publication(s)

Publication	Citations
AFMAN11-202V3	9
AFMAN	1

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.

Unofficial reference aid. Confirm against the current eCFR edition before citing in a finding.