https://www.devex.com/people/aa-american-airlines-provides-a-24-hour-refund-policy-2013594

https://www.devex.com/people/faq-american-airlines-provides-a-24-hour-refund-policy-2013409

https://www.honor.com/globalgm/club/topicdetail/topicid-3624866920169472/

https://www.honor.com/globalgm/club/topicdetail/topicid-3624866920169472/

https://supportsi.hexagon.com/help/s/question/0D5Tc00000HHigqKAD/aaservicescan-i-cancel-a-flight-and-get-a-refund-in-american?language=en_US

https://supportsi.hexagon.com/help/s/question/0D5Tc00000HHjTgKAL/aa-18777903320-what-is-the-cancellation-policy-for-american-airlines?langua...

https://www.aomeitech.com/forum/discussion/22754/%CF%9C-%E1%BD%80%CD%B7%CD%B3%CE%AF%E1%BC%93-how-long-do-you-have-to-cancel-with-frontier-as...

https://www.aomeitech.com/forum/discussion/23183/how-long-do-you-have-to-cancel-with-frontier-how-to-connect/p1?new=1

https://www.aomeitech.com/forum/discussion/22777/does-frontier-give-refunds-for-cancelled-flights-fast-representative/p1?new=1

https://www.aomeitech.com/forum/discussion/22501/how-long-do-you-have-to-cancel-with-frontier-how-to-cancel/p1?new=1