The "XF" tail numbers are a subtle nod to their Frontier Airlines heritage. While these aircraft now wear American Airlines' iconic livery, their history interests aviation enthusiasts.

Frontier Airlines originally started operations in ... the brand identity. A new livery and logo were ordered from PS: ...

The Transportation Department is stepping up enforcement of persistent flight delays with a lawsuit against Southwest Airlines and a fine against Frontier Airlines. The agency said the U.S ...

The Transportation Department is stepping up enforcement of persistent flight delays with a lawsuit against Southwest Airlines and a fine against Frontier Airlines ...