https://www.devex.com/people/how-to-cancel-your-american-airlines-flight-ticket-a-step-by-step-guide-2307500
https://www.devex.com/people/american-airlines-flight-cancellation-everything-you-need-to-know-2307523
https://www.devex.com/people/american-airlines-ticket-cancellation-guide-easy-steps-to-follow-2307653
https://www.devex.com/people/changing-plans-how-to-easily-cancel-your-united-airlines-flight-2308094
https://www.devex.com/people/cancel-and-reboot-delta-flexible-travel-policy-explained-2309077