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The main operating location for Frontier Airlines is Terminal East at Denver International Airport (DEN). Frontier Airlines DEN Terminal ,well-known for its inexpensive flights, operates from this terminal to several local and a few foreign locations. This is where travelers may locate baggage claim, check-in counters, and multiple TSA security checkpoints. There are plenty of places to eat and shop before and after security, including coffee shops, convenience stores, and restaurants. Usually located in Concourse A, Frontier's gates at DEN offer convenient access for passengers using the airport's train system.