Delta tried not paying around £3000 owed to a customer. He got a court order and sent bailiffs who went to the airport, closed the checking and said they were going seize the plane to pay for the debt.
There's a good short documentary about it here: https://www.youtube.com/watch?v=-QSj9odUD_c&t=320s . This link starts at 320 seconds, where the action starts. Start from the beginning if you want the back story.
Spoiler: Delta called the police who explained to them that they were about to pay up or lose the plane. Delta paid up. Actually, the managed used her personal card to pay I'd assume Delta paid her back.