Southwest Airlines made known today that during March 2006 it carried 5.8 million passengers with a raise of the 11.4% respect the same period of the previous year when they were 5.2 million. Low-cost carrier, one of the most important of the USA, also made known that its seats availability, even in the same period, increased of the 8.7%. In the first quarter of the 2006 it carried 15.3 million people...