- https://community.hologram.io/t/what-is-the-cancellation-policy-of-united/23465
- https://www.devex.com/people/l-_-what-is-the-cancellation-policy-united-2268165
- https://community.hologram.io/t/last-minutes-changes-what-is-the-cancellation-policy-of-united/23415
- https://www.devex.com/people/air-ravel-what-is-the-cancellation-policy-united-2268071