Code of Federal Regulations · Section
§ 91.173 — Atc Clearance And Flight Plan Required
14 C.F.R. § 91.173
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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.
Authorizing Statute
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Airman certificates49 U.S.C. § 44703
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Federal Aviation Administration49 U.S.C. § 106