Activity
- https://thelinuxforum.com/forum/general-linux-forums/general-linux-discussions/16701-%F0%9D%92%82%F0%9D%92%87%F0%9D%92%87%F0%9D%92%90%F0%9D%92%93%F0%9D%92%85%F0%9D%92%82%F0%9D%92%83%F0%9D%92%8D%F0%9D%
- https://thelinuxforum.com/forum/general-linux-forums/general-linux-discussions/16666-faq~united%E2%84%A2%EF%B8%8F-what-is-the-cheapest-day-to-book-flights-on-united-airlines
- https://knowt.com/note/15a68b10-4f07-4e21-b429-fd038c793ffc/What-is-the-cheapest-day-to-book-flights
