Frontier Airlines Denver International Airport provides services from Denver International Airport out of Concourse A, while it is actually the airline's main hub. Frontier Airlines advertises ultra-low-cost fares in order to cater to a need for affordable services. Check-in counters are accompanied by self-service kiosks and TSA PreCheck lanes along with a comprehensive dining, coffee, and retail array. There are also amiable seating areas and charging stations to stay connected within the concourse. DEN allows easy access to the automated train system which connects all terminals, parking, and ground transportation; hence, Frontier delivers an incredible experience for travelers both within the United States and internationally.