Table 3. System* Quarterly Operating profit/loss margin (in percent),,,,,,, Low-Cost Carriers ,,,,,,, Ranked by 3rd Quarter 2006 Margin ,,,,,,, (Operating Profit/Loss as Percent of Total Operating Revenue,,,,,,, 3Q 2006 Rank,Low-Cost Carriers,3rd Quarter 2005 (%),4th Quarter 2005 (%),1st Quarter 2006 (%),2nd Quarter 2006 (%),3rd Quarter 2006 (%),3rd Quarter Operating Profit/Loss $(Millions) 1,Southwest,13.7,8.2,4.9,16.4,11.2,261 2,JetBlue,3.2,-4.0,-5.1,7.7,5.5,34 3,ATA,-47.9,50.1,-13.1,-0.7,2.2,5 4,Frontier,5.3,-4.7,-3.4,3.5,1.0,3 5,AirTran,0.3,0.5,-1.1,10.3,-0.7,-4 6,America West,-6.5,-16.7,9.4,5.9,-11.2,-107 7,Spirit,-14.2,-22.3,-7.3,-3.2,-20.3,-26 ,Seven-Carrier Total,2.1,1.8,2.5,10.8,3.3,167 "Source: Bureau of Transportation Statistics; Form 41, Schedule P1.2 ",,,,,,, * System = domestic + international ,,,,,,, ,,,,,,,