https://www.devex.com/people/connect_usa-how-late-can-you-cancel-a-fully-refundable-ticket-2285366
https://www.devex.com/people/sa-r-fund-licy_what-is-the-cancellation-policy-on-2285537
https://www.devex.com/people/penalty_is-there-a-penalty-to-cancel-a-united-flight-2285653
https://www.devex.com/people/usa_penatly-is-there-a-penalty-to-cancel-a-united-flight-2285776