The Department of Transportation sued Southwest Airlines on Wednesday, accusing the carrier of operating chronically delayed flights from April to August 2022. The DOT claims Southwest failed to adjust unrealistic schedules, causing harm to customers. The DOT alleges that Southwest Airlines knowingly marketed flights with unrealistic schedules, failing to adjust for consistent delays and causing harm to customers. Southwest called the lawsuit "not credible" and emphasized its 15-year compliance record with DOT policies.