StacksVerified U.S. regulatory reference

14 CFR §121.509

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (a)No certificate holder conducting supplemental operations may schedule a pilot—
    1. (1)For flight deck duty in an airplane that has a crew of four pilots for more than eight hours in any 24 consecutive hours; or
    2. (2)To be aloft in an airplane that has a crew of four pilots for more than 16 hours in any 24 consecutive hours.
  2. (b)No pilot of an airplane that has a crew of four pilots may be on duty for more than 20 hours in any 24 consecutive hours.