https://www.transfermarkt.com/-a-a-cheapest-what-days-are-american-airlines-cheapest-to-fly-/thread/forum/696/thread_id/28010/page/1#anchor_28680
https://www.transfermarkt.com/-a-a-cheapest-what-days-are-american-airlines-cheapest-to-fly-/thread/forum/696/thread_id/28010/page/1#anchor_28680