- https://www.devex.com/people/how-long-do-i-have-to-cancel-a-delta-flight-without-penalty-2361808
- https://www.devex.com/people/how-long-do-i-have-to-cancel-a-delta-flight-without-penalty-2361768
- Jean_Trebek_Beauty_in_Nature
- https://www.devex.com/people/is-there-a-penalty-for-canceling-a-southwest-flight-2361679
