- https://community.hologram.io/t/what-is-the-cancellation-policy-on-united/23273https://community.hologram.io/t/what-is-the-cancellation-policy-on-united/23273
- https://www.devex.com/people/what-is-the-cancellation-policy-for-united-airlines-2267760
- https://community.hologram.io/t/cancellation-refund-what-is-the-cancellation-policy-on-united/23225