https://www.goodreads.com/topic/show/23055458-cheapestaadays-what-day-of-the-week-is-best-to-book-a-flight-on-delta
https://www.goodreads.com/topic/show/23055458-cheapestaadays-what-day-of-the-week-is-best-to-book-a-flight-on-delta
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