https://forum.dimensionengineering.com/topic/10289-tipsa-faqs%E2%84%A2247what-is-the-cheapest-day-to-fly-on-%F0%9D%93%90%F0%9D%93%B6%F0%9D%93%AE%F0%9D%93%BB%F0%9D%93%B2%F0%9D%93%AC%F0%9D%93%AA%F0%9D%93%B7-%F0%9D%93%90%F0%9D%93%B2%F0%9D%93%BB%F0%9D%93%B5%F0%9D%93%B2%F0%9D%93%B7%F0%9D%93%AE%F0%9D%93%BC/