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Frontier Airlines DEN Terminal at Denver International Airport (DEN) operates from Terminal A, offering a range of services for passengers traveling domestically and internationally. As a budget airline, Frontier focuses on providing affordable travel options, with add-on fees for services like seat selection, baggage, and refreshments. Passengers are encouraged to check in online to save time at the airport. The airline complies with all TSA regulations, requiring valid identification and security screening. For customers flying with pets, Frontier allows small animals in the cabin for a fee, subject to carrier size and weight restrictions. Travelers should review the airline’s policies to ensure a smooth experience.