https://www.devex.com/people/faq-what-is-the-fee-to-cancel-a-flight-on-american-airlines-2358577

https://www.devex.com/people/klm-flight-changes-and-cancellations-a-quick-overview-2359177

https://tabellaesupport.microsoftcrmportals.com/forums/general-discussion/be9571bd-88c9-ef11-a81b-0022489f0209

https://www.devex.com/people/does-klm-offer-free-cancellation-immediate-answer-2359162

https://www.devex.com/people/support_team-does-british-airways-have-a-cancellation-policy-2358561

https://www.devex.com/people/politica-de-cancelacion-how-long-does-delta-give-you-to-cancel-2358555

https://www.yelp.com/biz_photos/norse-atlantic-airways-queens-6?select=Tix95Y7CLg_1MN5mk8oNKQ&utm_campaign=www_photo_share_popup&utm_medium=copy_link&utm_source=%28direct%29

https://www.devex.com/people/klm-flight-changes-and-cancellations-a-quick-overview-2359177