https://central.xero.com/s/question/0D58V00009OP2HFSA1/officialrefundhow-long-after-booking-frontier-flight-can-you-ca100refund
https://www.entmasterclass.com/forum/general-discussion/p-r-tm-does-spirit-airlines-refund-money-does-spirit-have-a-24-hour-cancellation-policy