Table 2: System* Quarterly Operating profit/loss margin (in percent),,,,,,, Network Carriers ,,,,,,, Ranked by 4th Quarter 2006 Margin ,,,,,,, (Operating Profit/Loss as Percent of Total Operating Revenue),,,,,,, 4Q 2006 Rank,Network Carriers,4th Quarter 2005 (%),1st Quarter 2006 (%),2nd Quarter 2006 (%),3rd Quarter 2006 (%),4th Quarter 2006 (%),4th Quarter Operating Profit/Loss $(Millions) 1,US Airways,-4.0,2.4,12.6,5.9,7.4,145 2,Northwest,-8.6,-0.2,9.2,11.1,3.7,110 3,American,-8.5,1.0,7.0,3.8,2.3,125 4,United,-4.6,-3.8,5.1,6.6,0.3,15 5,Continental,-3.7,-0.1,6.8,4.9,0.2,6 6,Delta,-12.3,-12.8,8.0,3.0,-0.1,-3 7,Alaska,-3.7,-25.1,6.3,0.5,-0.7,-5 ,Seven-Carrier Total,-7.3,-3.3,7.5,5.4,1.7,393 "Source: Bureau of Transportation Statistics; Form 41, Schedule P1.2 ",,,,,,, * System = domestic + international,,,,,,,