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https://intercom.help/lines-c0ce497a7978/en/articles/10869246-what-is-the-best-day-to-book-a-flight-on-american-airlines-direct-flights

https://support.google.com/phoneapp/thread/332604518?hl=en&sjid=4259815413343216004-NC

https://intercom.help/airline-0d1a1e82ff1d/en/articles/10869419-the-customer-service-can-i-cancel-my-british-airways-flight-and-get-a-refund

https://support.google.com/phoneapp/thread/332625036?hl=en&sjid=5618238478152080450-NC

https://intercom.help/mp-intercom/en/articles/10868688-how-do-i-avoid-expedia-cancellation-fees

https://intercom.help/expedia-customer-support-744e965b8721/en/articles/10869418-get-refund-does-expedia-actually-refund-money

https://support.google.com/edu/classroom/thread/332636671?hl=en&sjid=9982114038963000848-NA

https://intercom.help/lines-c0ce497a7978/en/articles/10869246-what-is-the-best-day-to-book-a-flight-on-american-airlines-direct-flights

https://support.google.com/edu/classroom/thread/332636671?hl=en&sjid=9982114038963000848-NA