FAR/AIM
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Federal Aviation Regulations
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PART 121—OPERATING REQUIREMENTS: DOMESTIC, FLAG, AND SUPPLEMENTAL OPERATIONS
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Subpart T—Flight Operations
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§ 121.551 – Restriction or suspension of operation: Domestic and flag operations.
§ 121.551 – Restriction or suspension of operation: Domestic and flag operations.
When a certificate holder conducting domestic or flag operations knows of conditions, including airport and runway conditions, that are a hazard to safe operations, it shall restrict or suspend operations until those conditions are corrected.