https://pressbooks.pub/customersupport/chapter/call-%e2%98%8e%ef%b8%8f1888-417-5699-what-is-the-cheapest-day-to-book-flights-on-air-canada/
https://pressbooks.pub/customersupport/chapter/call-%e2%98%8e%ef%b8%8f1888-417-5699-what-is-the-cheapest-day-to-book-flights-on-air-canada/