Table 11.  System* Airline Unit Costs (Cents per Mile),,,,,,,
Low-Cost Carriers,,,,,,,
Ranked by 1st Quarter 2007 Unit Costs ,,,,,,,
(Operating Expenses per Available Seat Mile in cents),,,,,,,
1Q 2007 Rank,Low-Cost Carriers,1st Quarter 2006 ,2nd Quarter 2006 ,3rd Quarter 2006 ,4th Quarter 2006 ,1st Quarter 2007 ,1st Quarter Operating Expenses $(Millions)
1,America West,11.1,12.7,14.1,13.6,12.1,853
2,ATA,10.0,10.0,9.5,9.1,9.9,187
3,Frontier,10.7,11.0,11.1,10.8,9.7,288
4,AirTran,9.7,10.0,9.9,9.2,9.4,491
5,Southwest,8.7,8.9,8.7,8.8,8.9,"2,114"
6,Spirit,9.5,11.5,11.7,10.9,8.3,161
7,JetBlue,7.8,7.8,7.9,7.9,8.3,621
,Seven-Carrier Total,9.2,9.7,9.8,9.5,9.4,"4,716"
 Source: Bureau of Transportation Statistics; Form 41; Schedule P1.2.  T100; T2 Data,,,,,,,
* System = domestic + international ,,,,,,,