https://knowledge.duress.com/forums/general-discussion/7050ad30-70b2-ef11-95f6-000d3a799cb1

https://knowledge.duress.com/forums/general-discussion/dc788d15-6ab2-ef11-95f6-7c1e522a9dd5

https://www.reddit.com/r/unitedairlines/comments/1h6ns1x/how_much_does_it_cost_to_cancel_frontier_tickets/?utm_source=share&utm_medium=web3x&utm_name=web3xcss&utm_term=1&utm_content=share_button

https://knowledge.duress.com/forums/general-discussion/6e50ad30-70b2-ef11-95f6-000d3a799cb1

https://www.devex.com/people/frontier-telefono-mexico-frontier-airlines-telefono-mexico-24-horas-2141532

https://knowledge.duress.com/forums/general-discussion/9428624a-6eb2-ef11-95f6-000d3a799cb1

https://www.devex.com/people/frontier-telefono-mexico-como-llamar-a-frontier-en-espanol-2141359

https://knowledge.duress.com/forums/general-discussion/db788d15-6ab2-ef11-95f6-7c1e522a9dd5

https://knowledge.duress.com/forums/general-discussion/b6abed3a-64b2-ef11-95f6-7c1e522a9dd5

https://support.google.com/assistant/thread/311467749?hl=en&sjid=5479136563886832802-AP