With state-of-the-art facilities and effective services, KLM Airlines provides a flawless travel experience out of Athens International Airport (ATH).  KLM Airlines ATH Terminal   During lengthy flight delays, travelers can take advantage of cozy lounges, an array of culinary choices, and easy access to shopping. Check-in and boarding procedures are made easier at the terminal by the friendly staff and well-marked signs. Traveling from ATH to a number of overseas locations is made easy by KLM's dedication to customer pleasure.