https://www.devex.com/people/for-how-long-is-it-free-to-cancel-a-delta-flight-2364886

https://www.devex.com/people/for-how-long-is-it-free-to-cancel-a-delta-flight-2364886

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https://www.devex.com/people/for-how-long-is-it-free-to-cancel-a-delta-flight-2364886