Southwest Airlines has begun to enforce a new no-show policy.
Passengers who need to cancel a flight must do so at least 10 minutes before departure, or lose the entire value of the ticket.
The airline still lets customers make changes to their tickets at no charge, and excludes military and senior fares. The no-show policy also excludes travel during bad weather.
Previously, travelers could simply not show up, and then contact the airline at a later time to use the remaining funds toward a new flight.
Brad Hawkins, a spokesman for Southwest, said that denied the company a chance to resell those seats to other passengers.
The new policy first went into effect for Friday's flights.