Table 2: System* Quarterly Operating profit/loss margin (in percent),,,,,,, Network Carriers ,,,,,,, Ranked by 1st Quarter 2007 Margin ,,,,,,, (Operating Profit/Loss as Percent of Total Operating Revenue),,,,,,, 1Q 2007 Rank,Network Carriers,1st Quarter 2006 (%),2nd Quarter 2006 (%),3rd Quarter 2006 (%),4th Quarter 2006 (%),1st Quarter 2007 (%),1st Quarter Operating Profit/Loss $(Millions) 1,Northwest,-0.2,9.2,11.1,3.7,7.2,205 2,US Airways,2.4,12.6,5.9,7.4,4.4,84 3,Delta,-12.8,8.0,3.0,-0.1,3.5,147 4,American,1.0,7.0,3.8,2.3,3.4,183 5,Continental,-0.1,6.8,4.9,0.2,1.5,45 6,United,-3.8,5.1,6.6,0.3,-2.0,-89 7,Alaska,-25.1,6.3,0.5,-0.7,-2.7,-18 ,Seven-Carrier Total,-3.3,7.5,5.4,1.7,2.5,559 " Source: Bureau of Transportation Statistics; Form 41, Schedule P1.2 ",,,,,,, * System = domestic + international ,,,,,,,