https://support.google.com/edu/classroom/thread/334216018?hl=en&sjid=12601719208704038909-NA

https://intercom.help/grt-b90528abe28a/en/articles/10978028-count-on-services-can-you-change-a-lufthansa-flight-for-free

https://intercom.help/all-airlines-support/en/articles/10978042-cont-ct-now-what-is-the-cheapest-day-to-book-a-jetblue-flight

https://intercom.help/all-airlines-support/en/articles/10978118-wed-nes-day-what-is-the-cheapest-day-to-fly-on-jetblue

https://intercom.help/all-airlines-support/en/articles/10976847-what-is-the-cheapest-day-to-fly-on-jetblue-increase-your-chances-of-securing-a-budget-friendly

https://intercom.help/grt-b90528abe28a/en/articles/10978142-what-days-are-american-airlines-cheapest-to-fly

https://intercom.help/grt-b90528abe28a/en/articles/10977158-%F0%9D%99%B6%F0%9D%9A%8E%F0%9D%9A%97%F0%9D%9A%8E%F0%9D%9A%9B%F0%9D%9A%8A%F0%9D%9A%95-%F0%9D%99%B5%F0%9D%99%B0%F0%9D%9A%80%F0%9D%9A%9C-what-day-of-the-week-is-best-to-book-a-flight-on-%F0%9D%99%B0%F0%9D%9A%96%F0%9D%9A%8E%F0%9D%9A%9B%F0%9D%9A%92%F0%9D%9A%8C%F0%9D%9A%8A%F0%9D%9A%97-%F0%9D%99%B0%F0%9D%9A%92%F0%9D%9A%9B%F0%9D%9A%95%F0%9D%9A%92%F0%9D%9A%97%F0%9D%9A%8E%F0%9D%9A%9C

https://support.google.com/edu/classroom/thread/334216514?hl=en&sjid=3074983794088648473-NA