https://www.devex.com/people/rules-what-is-the-24-hour-rule-for-klm-2378824

https://www.devex.com/people/refund_policy-is-it-possible-to-get-a-refund-from-klm-2378809

https://www.devex.com/people/contact-usa-can-i-cancel-a-flight-in-united-and-get-a-refund-2378635

https://www.devex.com/people/what-is-the-24-hour-rule-for-klm-2378611

https://www.devex.com/people/faq-s-what-is-the-24-hour-rule-for-klm-2378411

https://www.devex.com/people/aa_faq-s_what-is-the-cancellation-policy-on-american-airlines-2378317

https://www.devex.com/people/noo-fee-what-is-the-cancellation-policy-on-united-2378275

https://www.devex.com/people/what-is-the-cancellation-policy-for-united-airlines-2378223

https://www.devex.com/people/cancel-guide-what-is-the-cancellation-policy-on-united-2378127

https://www.devex.com/people/policy-guide-what-is-the-cancellation-policy-on-united-2378081