Southwest Airlines does not operate at ATH/ Greece. It only uses a network of domestic US routes, supported by a handful of international destinations, according to the airline's route map. Southwest Airlines ATH Terminal operates at many of the major airports in the US and travels internationally to destinations in Mexico, the Caribbean and Central America. Therefore, travelers flying from Athens would likely have to connect through a major U.S. airport, such as Chicago or New York, to access Southwest Airlines flights.

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