https://www.devex.com/people/is-there-a-penalty-to-cancel-a-united-flight-2302022
https://www.devex.com/people/help-is-there-a-penalty-to-cancel-a-united-flight-2302040
https://www.devex.com/people/free-refund-is-there-a-penalty-to-cancel-a-united-flight-2302074
https://www.devex.com/people/faq-can-i-cancel-my-southwest-flight-without-penalty-2300564
https://www.devex.com/people/refund-back-can-i-cancel-my-southwest-flight-without-penalty-2300797
https://www.devex.com/people/free-can-i-cancel-my-southwest-flight-without-penalty-2300914
