https://www.devex.com/people/ua-check-in-process-united-check-in-2023553

https://communicators.ncsu.edu/forum/check-in-m-united-airline-check-in-policy

https://communicators.ncsu.edu/forum/unitedm-cancellation-1-888-829-1117-united-airline-cancellation-p

https://www.honor.com/globalgm/club/topicdetail/topicid-3625954178105345/

https://www.devex.com/people/cancellation_-what-is-ited-cancellation-policy-2023358

https://shorturl.at/MYVmj

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