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https://support.us.edu/hc/en-us/community/posts/26996335235095-Swiss-Air-1-888-408-4649-Swiss-Air-Cancellation-policy-Expert-TEAM for more d...

https://www.devex.com/people/alaska-airlines-cancellation-process-2017619

https://www.devex.com/people/does-delta-have-a-cancellation-policy-2017349