Operating out of Denver International Airport’s Concourse A is Lufthansa Airlines DEN Terminal. Savor quick and easy check-in choices, such as self-service kiosks and internet check-in. The Lufthansa Business Lounge is available to passengers for a relaxing pre-flight experience. Economy Class includes one checked bag up to 23 kg in weight. While you’re waiting for your flight, check out the various food and retail alternatives.