https://www.devex.com/people/does-lufthansa-allow-flight-changes-2460795

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https://www.devex.com/people/can-you-cancel-with-expedia-and-get-a-refund-2454613

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patch.com/new-york

https://thelinuxforum.com/forum/general-linux-forums/general-linux-discussions/8674-%E3%80%90sp~cancel~money-%E3%80%91how-do-i-avoid-the-spirit-cancellation-fee