Frontier Airlines is a United States low-cost carrier airline. It is based in Denver, Colorado. It operates flights to 52 destinations throughout the United States and 7 international destinations. The airline has fewer hubs compared to the major carriers but it’s main hub is at Denver International Airport. In 2014, the company announced that it will become ultra-low cost carrier as it struggled to find relevance in an increasingly consolidating airline market in North America that has seen the merger of Northwest, US Airways, AirTran, Continental and many others.