StacksVerified U.S. regulatory reference

14 CFR §135.217

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
No person may takeoff an aircraft under IFR from an airport where weather conditions are at or above takeoff minimums but are below authorized IFR landing minimums unless there is an alternate airport within 1 hour's flying time (at normal cruising speed, in still air) of the airport of departure.