StacksVerified U.S. regulatory reference

14 CFR §121.555

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
No pilot may operate an airplane in scheduled air transportation—
  1. (a)Over any route or route segment unless it is specified in the certificate holder's operations specifications; or
  2. (b)Other than in accordance with the limitations in the operations specifications.