14 CFR · Part 91
14 CFR § 91.173
ATC clearance and flight plan required.
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.
Referenced By
Interpretations of This Section (2)
Documents that cite this section, found in their catalog metadata or text. Listed by date, not by significance.
Reflects the eCFR edition current as of July 6, 2026. Retrieved from ecfr.gov on July 17, 2026.
Primary Source