https://www.devex.com/people/what-is-the-cheapest-day-to-book-flights-on-delta-2150533
https://www.devex.com/people/what-is-the-cheapest-day-to-book-flights-on-delta-2150533https://www.devex.com/people/what-is-the-cheapest-day-to-book-flights-on-delta-2150533
https://www.devex.com/people/what-is-the-cheapest-day-to-book-flights-on-delta-2150533
https://www.devex.com/people/what-is-the-cheapest-day-to-book-flights-on-delta-2150533