{"data":{"id":"us/14-cfr-121.553","jurisdiction":"us","citation":"14 CFR 121.553","heading":"Restriction or suspension of operation: Supplemental operations.","body":"When a certificate holder conducting supplemental operations or pilot in command knows of conditions, including airport and runway conditions, that are a hazard to safe operations, the certificate holder or pilot in command, as the case may be, shall restrict or suspend operations until those conditions are corrected.","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":"451d26896c33da8effb848166b9c24903c48bbbee23549b76296d89bfdf97fab","source_id":"us-cfr","stale":true,"prev":"us/14-cfr-121.551","next":"us/14-cfr-121.555"},"notice":"GroundRules: Original legal text. Not legal advice."}