https://www.devex.com/people/ua_faq-s-what-is-fully-refundable-on-united-2437066
https://www.devex.com/people/ua_faq-s-what-is-fully-refundable-on-united-2437066
https://www.devex.com/people/ua_faq-s-what-is-fully-refundable-on-united-2437066
https://www.devex.com/people/ua_faq-s-what-is-fully-refundable-on-united-2437066