https://central.xero.com/s/question/0D58V00009SGskXSAT/%F0%9D%94%A9%F0%9D%94%A2%F0%9D%94%A4%F0%9D%94%9E%F0%9D%94%A9-%F0%9D%94%A6%F0%9D%94%AB%F0%9D%94%A3%F0%9D%94%AC%F0%9D%94%AF%F0%9D%94%AAationwhat-is-the-cheapest-day-to-fly-on-air-%E2%84%82%F0%9D%95%92%F0%9D%95%9F%F0%9D%95%92%F0%9D%95%95%F0%9D%95%92