https://www.devex.com/people/what-is-the-cheapest-day-to-book-flights-on-united-airlines-2001289

https://support.us.edu/hc/en-us/profiles/26842185819671-itachiblaze

https://support.empowersuite.com/hc/en-us/community/posts/16231224246300--Travel-Guide-American-What-is-the-Cheapest-day-to-book-flights-on-American-Airlines

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