Table 7. System* Airline Unit Revenue (Cents Per Mile),,,,,,, Low-Cost Carriers ,,,,,,, Ranked by 2nd Quarter 2007 Unit Revenue,,,,,,, (Operating Revenue Per Available Seat Mile),,,,,,, 2Q 2007 Rank,Low-Cost Carriers,2nd Quarter 2006 ,3rd Quarter 2006 ,4th Quarter 2006 ,"1st Quarter 2007 ",2nd Quarter 2007 ,2nd Quarter Operating Revenue $(Millions) 1,America West,13.5,12.6,12.6,12.7,12.8,947 2,Frontier,11.4,11.3,10.1,9.5,10.7,345 3,AirTran,11.2,9.8,9.3,9.7,10.7,614 4,Southwest,10.7,9.8,9.5,9.3,10.3,"2,583" 5,Spirit,11.1,9.7,9.1,9.0,9.0,197 6,JetBlue,8.5,8.3,8.7,8.1,9.0,730 7,ATA,9.9,9.7,8.6,8.5,8.7,181 ,Seven-Carrier Total,10.9,10.1,9.8,9.6,10.4,"5,596" "Source: Bureau of Transportation Statistics; Form 41, Schedule P1.2. T100; T2 Data",,,,,,, * System = domestic + international ,,,,,,, ,,,,,,,