{"data":{"id":"us/14-cfr-121.555","jurisdiction":"us","citation":"14 CFR 121.555","heading":"Compliance with approved routes and limitations: Domestic and flag operations.","body":"No pilot may operate an airplane in scheduled air transportation—\n(a) Over any route or route segment unless it is specified in the certificate holder's operations specifications; or\n(b) Other than in accordance with the limitations in the operations specifications.","path":["Title 14—Aeronautics and Space","CHAPTER I—FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION","SUBCHAPTER G—AIR CARRIERS AND OPERATORS FOR COMPENSATION OR HIRE: CERTIFICATION AND OPERATIONS","PART 121—OPERATING REQUIREMENTS: DOMESTIC, FLAG, AND SUPPLEMENTAL OPERATIONS","Subpart T—Flight Operations"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-14.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:24:20Z","sha256":"a63bdaa92c1c33c5846bcaf919fcfb88cd6a227676b0b86494547566101b073e","source_id":"us-cfr","stale":true,"prev":"us/14-cfr-121.553","next":"us/14-cfr-121.557"},"notice":"GroundRules: Original legal text. Not legal advice."}