https://central.xero.com/s/question/0D58V00009PjDfiSAF/18777775206-what-is-the-%F0%9D%97%B0%F0%9D%97%B5%F0%9D%97%B2%F0%9D%97%AE%F0%9D%97%BD%F0%9D%97%B2%F0%9D%98%80%F0%9D%98%81-day-to-buy-delta-flights-thricehttps://central.xero.com/s/question/0D58V00009PjDfiSAF/18777775206-what-is-the-%F0%9D%97%B0%F0%9D%97%B5%F0%9D%97%B2%F0%9D%97%AE%F0%9D%97%BD%F0%9D%97%B2%F0%9D%98%80%F0%9D%98%81-day-to-buy-delta-flights-thrice