Airlines have fought against ‘throwaway ticketing’ for years. A ticket on United Airlines to Chicago might be super expensive, but connecting through Chicago to Milwaukee may be cheap. So passengers might buy a ticket to Milwaukee and just get off in Chicago and not board their final connection.
This past fall though we learned that United Airlines was threatening passengers with sending them to collections for the fare the carrier believes that they lost. They’re threatening to trash their customers’ credit report with a dubious debt, since the passenger never agreed to pay a different fare in the first place.