https://thelinuxforum.com/forum/general-linux-forums/general-linux-discussions/22604-qc-what-is-the-cheapest-day-of-the-week-to-fly-to-france

https://thelinuxforum.com/forum/general-linux-forums/general-linux-discussions/22604-q%E1%B5%A4%E1%B5%A2c%E2%82%96-what-is-the-cheapest-day-of-the-week-to-fly-to-france