A technical issue forced United Airlines to hold all mainline flights at departure airports on Wednesday evening, sparking travel chaos across the U.S.

United Airlines primarily deploys the Airbus A319-100 domestically, with only 770 of its flights with the type in May 2025 (around 7.85%) serving international routes.

A United Airlines Airbus A320 passenger jet taxis at Denver International Airport in Denver, Colorado. Robert Alexander/Getty Images Passengers booked on the routes will need to be reaccommodated ...

US airlines have the world's four largest fleets. Here's how the Boeing and Airbus planes operated by Delta, United, American, and Southwest shape up.