"Table 3. Top 10 U.S. Airlines, ranked by 2006 System* Scheduled Enplanements",,,,,, "Passenger numbers in millions (000,000) ",,,,,, 2006 Rank,Carrier,2006 Enplaned Passengers,2005 Rank,2005 Enplaned Passengers,, 1,American ,98.1,1,98.0,, 2,Southwest ,96.3,2,88.4,, 3,Delta,73.5,3,86.0,, 4,United ,69.3,4,66.7,, 5,Northwest ,54.8,5,56.5,, 6,Continental ,46.7,6,42.8,, 7,US Airways ,36.5,7,41.9,, 8,America West ,21.2,8,22.1,, 9,AirTran ,20.0,11,16.6,, 10,SkyWest ,19.5,12,16.6,, "Source: Bureau of Transportation Statistics, T-100 Market",,,,,, * System equals domestic plus international,,,,,, Note: Percentage changes based on numbers prior to rounding.,,,,,,