https://central.xero.com/s/question/0D58V00009RNekWSAT/unitedcheapest-what-is-the-cheapest-day-to-buy-flights-on-unitedhttps://central.xero.com/s/question/0D58V00009RNekWSAT/unitedcheapest-what-is-the-cheapest-day-to-buy-flights-on-unitedhttps://central.xero.com/s/question/0D58V00009RNekWSAT/unitedc...