https://central.xero.com/s/question/0D58V00009hMcB4SAK/delta-flight-hackswhat-day-of-the-week-is-the-cheapest-to-book-delta-flights youmobs 1 day ago https://central.xero.com/s/question/0D58V00009hMcB4SAK/delta-flight-hackswhat-day-of-the-week-is-the-cheapest-to-book-delta-flights