"Table 3. Top 10 U.S. Airlines, ranked by Jan.-March 2006 System* Enplanements",,,,, "Passenger numbers in millions (000,000) ",,,,, Jan.-Mar. 2006 Rank,Carrier,Jan.-Mar. 2006 Enplaned Passengers,Jan.-Mar. 2005 Rank,Jan.-Mar. 2005 Enplaned Passengers, ,,,,, 1,American Airlines,23.7,1,23.1, 2,Southwest Airlines,22.0,3,19.8, 3,Delta Air Lines,18.1,2,21.6, 4,United Airlines,16.3,4,15.6, 5,Northwest Airlines,12.6,5,13.5, 6,Continental Airlines,11.0,7,10.0, 7,U.S. Airways,8.8,6,10.6, 8,America West Airlines,5.1,8,5.2, 9,AirTran Airways,4.5,12,3.6, 10,SkyWest Airlines,4.5,11,3.7, "Source: Bureau of Transportation Statistics, T-100 Market",,,,, * System equals domestic plus international,,,,, Note: Percentage changes based on numbers prior to rounding,,,,,