United Airlines was fined over $1 million for an incident last year.
According to the Chicago Sun-Times:
United Airlines will pay more than $1 million in fines for stranding passengers on 13 planes for more than three hours on the tarmac last year at O’Hare International Airport.
The Transportation Department says it’s the biggest fine against an airline since 2010. That’s when new rules barred airlines from stranding passengers on the tarmac for longer than three hours without giving them the opportunity to leave the plane.