https://community.lumivero.com/s/question/0D5Jw00000eUjJHKA0/%F0%9D%93%93%F0%9D%93%AE%F0%9D%93%B5%F0%9D%93%BD%F0%9D%93%AA%F0%9D%93%A3%F0%9D%93%BB%F0%9D%93%AA%F0%9D%93%BF%F0%9D%93%AE%F0%9D%93%B5%F0%9D%93%B2%F0%9D%93%B7%F0%9D%93%B0-what-is-the-cheapest-day-to-buy-%F0%9D%92%9F%F0%9D%91%92%F0%9D%93%81%F0%9D%93%89%F0%9D%92%B6-flights