https://quickbooks.intuit.com/learn-support/en-ca/other-questions/unlock-savings-on-aa-what-day-is-the-cheapest-to-book-american/01/1507564#M22997
https://quickbooks.intuit.com/learn-support/en-ca/other-questions/unlock-savings-on-aa-what-day-is-the-cheapest-to-book-american/01/1507564#M22997