From its first flights on June 18, 1971, Southwest Airlines launched an era of unprecedented affordability in air travel described by the U.S. Department of Transportation as "The Southwest Effect," a lowering of fares and increase in passenger traffic wherever the carrier serves. With Southwest Airlines, Bags Fly Free ® (first and second checked pieces of luggage, size and weight limits apply), and there are no change fees (fare difference may apply) when you need to change your flight. Southwest's fleet offers leather seating and the comfort of full-size cabins, a majority of which are equipped with satellite-based WiFi connectivity over the United States, which enables live and video-on-demand TV currently FREE compliments of DISH, and a new, sustainable cabin interior. Southwest acquired AirTran Airways in May 2011 and by the end of 2014 intends to complete the full integration of the AirTran network into Southwest. With 41 consecutive years of profitability, the People of Southwest and AirTran operate more than 3,600 flights a day. Southwest Airlines' frequent flights and low fares are available online at southwest.com or by phone at 800-I-FLY-SWA.