American Airlines is adding its Five Star Service for premium cabin travelers to four U.S. airports: Austin, Nashville and Newark Liberty as of Aug. 1 and Atlanta as of Aug. 9. The service, available for purchase to travelers flying in premium cabins, includes Flagship and Admirals Club lounge access, gate escorts, higher priority boarding and reaccommodation status. The new airports, which American selected after analyzing travel patterns of current Five Star users, brings its availability to 16 domestic airports and four international airports.