United States
https://central.xero.com/s/question/0D58V00009OPvFiSAL/18558384701the-best-days-to-book-a-flight-and-when-to-fly
https://central.xero.com/s/question/0D58V00009OPtDaSAL/the-best-days-to-book-a-flight-and-when-to-fly18558384701
https://central.xero.com/s/question/0D58V00009OPtc6SAD/what-day-is-%F0%9D%93%AC%F0%9D%93%B1%F0%9D%93%AE%F0%9D%93%AApest-to-fly-cheapest-fly
https://central.xero.com/s/question/0D58V00009OPtfRSAT/what-day-is-cheapest-to-fly