https://apidocs.eightfold.ai/discuss/66fec9b3e97a1f00676e17ef

https://community.servicetitan.com/t5/General-Office/Know-United-Is-there-a-penalty-to-cancel-a-United-flight/m-p/66340#M9290

https://community.servicetitan.com/t5/General-Office/What-days-are-American-Airlines-cheapest-to-fly/td-p/65930

https://www.honor.com/globalgm/club/topicdetail/topicid-3623811434184705/

https://www.honor.com/globalgm/club/topicdetail/topicid-3623797980823552/

https://www.honor.com/globalgm/club/topicdetail/topicid-3623793818042368/

https://community.servicetitan.com/t5/General-Office/Does-United-still-offer-free-Cancellation/m-p/61151#M6238

https://community.servicetitan.com/t5/General-Office/Does-Air-France-allow-cancellations/m-p/60958#M6130

https://community.servicetitan.com/t5/General-Office/Know-United-How-late-can-you-cancel-a-refundable-United-flight/m-p/60396#M5848

https://www.honor.com/globalgm/club/topicdetail/topicid-3623759879897088/