Frontier Airlines is a low-cost airline that operates flights to over 100 destinations in the United States, Mexico, and the Caribbean. The company was founded in 1994 and is headquartered in Denver, Colorado. Frontier Airlines is known for its low fares and customer-friendly policies, such as allowing passengers to bring one personal item and one carry-on bag for free. The airline has a fleet of over 100 aircraft and is constantly expanding its route network.