Specialties: Frontier Airlines is a major ultra-low-cost American airline headquartered in Denver, Colorado. It operates flights to over 100 destinations throughout the United States and 31 international destinations, and employs more than 3,000 staff Established in 1994. Frontier Airlines is an owned subsidiary of Indigo Partners. Currently in our 20th year of operations, we employ more than 3,800 aviation professionals and operate more than 350 daily flights from our hub at Denver International Airport. We offer routes to more than 75 destinations in the United States, Mexico, Costa Rica, Jamaica, and the Dominican Republic.