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- https://www.devex.com/people/contact-usa-can-i-cancel-a-flight-in-united-and-get-a-refund-2378635
- https://www.devex.com/people/noo-fee-can-i-cancel-a-flight-in-united-and-get-a-refund-2378626
- https://www.devex.com/people/what-is-the-24-hour-rule-for-klm-2378611
- https://www.devex.com/people/klm_policy-is-it-possible-to-get-a-refund-from-klm-2378482
