https://forum.dimensionengineering.com/topic/8988-flight-saverwhat-is-the-cheapest-day-to-buy–tickets/

https://forum.dimensionengineering.com/topic/8988-flight-saver%C2%AEwhat-is-the-cheapest-day-to-buy-%F0%9D%98%8B%F0%9D%98%A6%F0%9D%98%AD%F0%9D%98%B5%F0%9D%98%A2-tickets/