AirTran Airways passengers can test out the airline’s in-flight Internet for free or at a discount through one of the airline’s several WiFi promotions. AirTran passengers flying between Boston and Baltimore (BWI) can receive unlimited free WiFi sessions.

The offer is valid through Dec. 31, 2009 for travel in either direction and passengers can use promotion code BOSBWI to access the in-flight Internet. Also through Dec. 31, 2009, passengers on all AirTran flights can access the Gogo Internet service for free the first time they log on. Use promotion code AIRTRANTRYGOGO.

Passengers who purchase a full-price WiFi session will receive a promotion code via email for a second free session. And you can purchase a Gogo Internet 30-day pass for $24.95 (normally $49.95) through Dec. 31, 2009. All of AirTran Airways planes are equipped with WiFi Internet service. Visit http://insideflyerus.wpengine.com/link/?1996 for details.