For a relaxing pre-flight experience, travelers can access the Lufthansa Airlines DEN Terminal Business Lounge. Economy Class allows one checked bag weighing up to 23 kilograms. While you wait for your flight, explore a variety of food and retail alternatives.Concourse A of Denver International Airport is the airline's operating base (DEN). Take advantage of quick check-in choices, such as self-service kiosks and internet check-in.