United States
https://central.xero.com/s/question/0D58V00009OxxpySAB/letsknow-what-is-the-cheapest-day-to-buy-flights-on-%F0%9D%95%8C%F0%9D%95%9F%F0%9D%95%9A%F0%9D%95%A5ed-pp
https://central.xero.com/s/question/0D58V00009OxxorSAB/uawhat-is-the-cheapest-day-to-buy-flights-on-%F0%9D%95%8C%F0%9D%95%9F%F0%9D%95%9A%F0%9D%95%A5ed-lets-know
https://central.xero.com/s/question/0D58V00009OxwZKSAZ/ppwhat-is-the-cheapest-day-of-week-to-book-united-flight-lets-know