https://www.devex.com/people/what-day-of-the-week-are-american-airlines-tickets-the-cheapest-2378330

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

https://www.devex.com/people/ua-process-what-is-the-cancellation-policy-for-united-airlines-2378295

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

https://www.devex.com/people/airline-info-what-is-the-cancellation-policy-on-united-2378243

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

https://www.devex.com/people/airline-info-what-is-the-cancellation-policy-on-united-2378148

https://www.devex.com/people/contact-usa-what-is-the-cancellation-policy-on-united-2378115

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

https://www.devex.com/people/faq_how-many-days-before-a-delta-flight-can-you-cancel-2377961

https://www.devex.com/people/policy-guide-do-you-lose-all-your-money-if-you-cancel-a-flight-2377913

https://www.devex.com/people/faqs-help-do-you-lose-all-your-money-if-you-cancel-a-flight-2377884