The official Southwest Airlines ATH Terminal does not exist because Southwest Airlines does not operate flights to Athens International Airport (ATH). The airline only operates flights within the US and to a few adjacent foreign countries. Traveling to Athens, Greece, will need you to take a different airline. After you get back to the United States, you can continue traveling with Southwest. To ensure a seamless travel experience, always verify your flight and terminal information in advance. visit us-- https://www.airportsterminalnearme.com/southwest-airlines/southwest-airlines-ath-terminal-athens-international-airport/