American Airlines DEN Terminal American Airlines operates from the East side of Jeppesen Terminal at Denver International Airport (DEN), offering convenient access to check-in counters and gates. The terminal features modern amenities including TSA PreCheck, curbside check-in, and mobile boarding passes2. Travelers flying with American Airlines DEN Terminal should arrive early due to ongoing construction. Concourse C serves most American Airlines flights, ensuring smooth connections and efficient boarding procedures https://www.terminalsmap.com/american-airlines/american-airlines-den-terminal/ https://www.terminalsmap.com/klm-royal-dutch-airlines/klm-jfk-terminal/