https://developer-community.sage.com/topic/11778-frontier-airlinecan-i-cancel-my-frontier-flight-without-penaltyget-official-support/

https://developer-community.sage.com/topic/11778-%E3%80%90%E2%84%A2frontier-airline%E2%84%A2%E3%80%91can-i-cancel-my-frontier-flight-without-penaltyget-official-support/