https://community.servicetitan.com/t5/General-Office/1-855-738-4035-What-Is-The-Cheapest-Day-To-Book-Flights-On/m-p/55275#M3048

https://community.servicetitan.com/t5/General-Office/1-833-563-0181-What-is-the-cheapest-day-to-book-on-Expedia/m-p/55502#M3206

https://support.hammerhead.io/hc/en-us/community/posts/29741303827739--1-855-738-4035-AA-What-days-are-cheapest-for-American-%F0%9D%94%B8%F0%9D%95%9A%F0%9D%95%A3lines

https://support.hammerhead.io/hc/en-us/community/posts/29741303827739--1-855-738-4035-AA-What-days-are-cheapest-for-American-%F0%9D%94%B8%F0%9D%95%9A%F0%9D%95%A3lines

https://support.communitybrands.com/hc/en-us/community/posts/30754965666061-Refund-Cancellation-1-888-829-1117-Can-I-cancel-my-United-flight-free-of-charge-UA-Helpline

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https://community.servicetitan.com/t5/General-Office/What-day-is-cheapest-to-book-American-Airlines-Cheapest-Fare/m-p/65295#M8772

https://www.devex.com/people/what-is-the-cheapest-day-to-buy-tickets-on-expedia-1999328