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https://community.bluebeam.com/bluebeam-community/discussion/1428/what-1-888-738-0817-is-the-cheapest-day-to-book-flights-on-united-%F0%9D%95%AC%F0%9D%96%8E%F0%9D%96%97%F0%9D%96%91%F0%9D%96%8E%F0%9D%96%93%F0%9D%96%8A%F0%9D%96%98-travel-%EF%B8%8F-%EF%B8%8F/p1?new=1