Table 4. System* Quarterly Operating profit/loss margin (in percent),,,,,,, Regional Carriers ,,,,,,, Ranked by 3rd Quarter 2006 Margin ,,,,,,, (Operating Profit/Loss as Percent of Total Operating Revenue) ,,,,,,, 3Q 2006 Rank,Regional Carriers,3rd Quarter 2005 (%),4th Quarter 2005 (%),1st Quarter 2006 (%),2nd Quarter 2006 (%),3rd Quarter 2006 (%),3rd Quarter Operating Profit/Loss $(Millions) 1,Pinnacle,-14.6,7.7,10.4,9.5,12.3,26 2,Atlantic Southeast,9.4,13.1,13.6,13.2,12.1,37 3,American Eagle,12.3,10.3,11.0,8.1,9.8,49 4,SkyWest,11.1,10.3,9.4,10.0,9.6,46 5,ExpressJet,9.8,10.1,9.4,8.5,8.4,36 6,Comair,2.6,-0.9,1.5,2.1,6.8,24 7,Mesa,13.0,10.3,8.9,4.1,3.7,11 ,Seven-Carrier Total,7.6,8.9,9.3,8.1,8.9,227 "Source: Bureau of Transportation Statistics; Form 41, Schedule P1.2 ",,,,,,, * System = domestic + international ,,,,,,, ,,,,,,,