https://hackmd.io/@James1998/rkqHBUVJ1l

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https://www.devex.com/people/f-a-q-lufthansa-does-lufthansa-offer-free-cancellation-2013456

https://support.us.edu/hc/en-us/community/posts/26956748701591–AA-How-Can-I-Get-in-Touch-with-American-Airlines-fast

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https://www.devex.com/people/amtrak-what-is-the-cheapest-day-to-buy-amtrak-tickets-2013490

https://www.devex.com/people/what-is-the-cheapest-day-to-buy-amtrak-tickets-2013454

https://www.devex.com/people/delta-cancellation-delta-airlines-cancellation-policy-2013397

https://www.devex.com/people/usa-faq-can-you-get-a-refund-from-turkish-airlines-2013420