The DOT filed a lawsuit against Southwest Airlines, citing a pattern of chronic delays, as the government pushes for stricter accountability.

Airlines have a legal obligation to ensure that their flight schedules provide travelers with realistic departure and arrival times," Transportation Secretary Pete Buttigieg said in a statement.

The Department of Transportation defines a flight to be chronically delayed if it is “flown at least 10 times a month and arrives more than 30 minutes late more than 50 percent of the time. Cancellations are included as delays within this calculation.”

Southwest is disappointed that DOT chose to file a lawsuit over two flights that occurred more than two years ago," a spokesperson for the airline said.

The US Department of Transportation sued Southwest Airlines and fined Frontier Airlines for flight delays, seeking civil penalties against Southwest and imposing a $650,000 fine on Frontier, part of a broader crackdown on airline delay issues.

The government also fined Denver-based discount carrier Frontier Airlines $650,000 for flight delay issues. The U.S. Department of Transportation said Southwest flight 1029 between Chicago Midway ...

The Transportation Department is stepping up enforcement of persistent flight delays with a civil lawsuit against Southwest Airlines and a fine against Frontier Airlines.

The Transportation Department is stepping up enforcement of persistent flight delays with a lawsuit against Southwest Airlines and a fine against Frontier Airlines. The agency said the U.S ...

What to know:Southwest Airlines offers a different experience. Here's how it works. The release also announced an enforcement action against Frontier Airlines for chronically delayed flights.

The Transportation Department is stepping up enforcement of persistent flight delays with a lawsuit against Southwest Airlines and a fine against Frontier Airlines The Transportation Department is ...

disclosed a lawsuit against Southwest Airlines, accusing the airline of chronically delayed flights and interrupting passengers’ travels. In addition, the DOT levied a fine against Frontier ...

The agency is seeking civil penalties against Southwest Airlines, and also fined Frontier Airlines for its continuous delays.