A new U.S. Department of Transportation rule that went into effect last month says if your flight is delayed by more than three hours for domestic trips, or more than six hours for international trips, you’re automatically entitled to a refund if you choose not to travel on the delayed flight, USA Today reported.

The Service Employees International Union announced the strike in a statement early Monday, saying the workers would demand “an end to poverty wages and respect on the job during the holiday travel season.