"Table 3. Top 10 U.S. Airlines, ranked by Jan.-April 2006 System* Enplanements",,,,, "Passenger numbers in millions (000,000) ",,,,, Jan.-Apr. 2006 Rank,Carrier,Jan.-Apr. 2006 Enplaned Passengers,Jan.-Apr. 2005 Rank,Jan.-Apr. 2005 Enplaned Passengers, ,,,,, 1,American Airlines,32.1,1,31.2, 2,Southwest Airlines,30.2,3,26.9, 3,Delta Air Lines,24.2,2,29.1, 4,United Airlines,22.1,4,21.0, 5,Northwest Airlines,17.2,5,18.4, 6,Continental Airlines,15.0,7,13.6, 7,US Airways,12.1,6,14.5, 8,America West Airlines,6.9,8,7.0, 9,AirTran Airways,6.3,12,4.9, 10,SkyWest Airlines,6.0,11,5.0, "Source: Bureau of Transportation Statistics, T-100 Market",,,,, * System equals domestic plus international,,,,, Note: Percentage changes based on numbers prior to rounding,,,,, ,,,,,