https://support.google.com/edu/classroom/thread/330040034/booking-policy-what-days-are-%F0%9D%95%AC%F0%9D%96%92%F0%9D%96%8A%F0%9D%96%97%F0%9D%96%8E%F0%9D%96%88%F0%9D%96%86%F0%9D%96%93-%F0%9D%95%AC%F0%9D%96%8E%F0%9D%96%97%F0%9D%96%91%F0%9D%96%8E%F0%9D%96%93%F0%9D%96%8A%F0%9D%96%98-cheapest-to-fly
