Https://www.studocu.com/in/document/sand-dunes-academy/dance-hl/what-is-the-cheapest-day-to-buy-flights-on-spirit-airlines/122583727?origin=library-upload-2 https://www.studocu.com/in/document/sand-dunes-academy/dance-hl/what-is-the-cheapest-day-to-buy-flights-on-spirit-airlines/122583727?origin=library-upload-2