Table 4: Regional Airline System* Quarterly Operating Profit/Loss Margin (In Percent) ,,,,,,, Ranked by 1st Quarter 2008 Margin ,,,,,,, (Operating Profit/Loss as Percent of Total Operating Revenue),,,,,,, 1Q 2008 Rank,Regional Airlines,1st Quarter 2007 (%),2nd Quarter 2007 (%),3rd Quarter 2007 (%),4th Quarter 2007 (%),1st Quarter 2008 (%),1st Quarter Operating Profit/Loss $(Millions) 1,Atlantic Southeast,12.9,11.6,12.9,10.5,8.1,29 2,Comair,2.5,7.0,5.6,8.2,7.8,26 3,SkyWest,7.6,9.1,9.5,9.2,7.2,37 4,American Eagle,11.2,10.3,6.5,8.9,4.1,21 5,Mesa,-8.2,3.1,3.6,-3.2,-2.6,-7 6,ExpressJet,3.8,-10.3,-8.1,-9.4,-7.7,-34 7,Horizon,-6.4,-1.8,4.0,-7.4,-11.0,-19 ,Seven-Carrier Total,5.3,5.0,4.9,3.6,2.0,53 "Source: Bureau of Transportation Statistics; Form 41, Schedule P1.2 ",,,,,,, * System = domestic + international,,,,,,, ,,,,,,, ,,,,,,,