- https://www.devex.com/people/find-cheapest-flight-tickets-what-is-the-cheapest-day-to-fly-on-american-2458903
- https://www.devex.com/people/find-cheapest-flight-tickets-what-is-the-cheapest-day-to-fly-on-united-2458830
- https://www.devex.com/people/how-to-find-cheapest-flight-tickets-what-is-the-cheapest-day-to-fly-on-delta-2458722
- https://www.devex.com/people/what-is-the-cheapest-day-to-buy-united-tickets-2458170
