United States
https://central.xero.com/s/question/0D58V00009OPxfRSAT/whats-the-cheapest-day-to-book-flights
https://www.entmasterclass.com/forum/general-discussion/wh-t-is-the-cheapest-day-to-book-flights-on-usa-2
https://www.entmasterclass.com/forum/general-discussion/wh-t-is-the-cheapest-day-to-book-flights-on-usa-1
https://central.xero.com/s/question/0D58V00009OPwdASAT/what-day-is-cheapest-to-fly-cheapest-fly
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