Table 11.  System* Airline Unit Costs (Cents per Mile),,,,,,,
Low-Cost Carriers,,,,,,,
Ranked by 4th Quarter 2006 Unit Costs ,,,,,,,
(Operating Expenses per Available Seat Mile in cents),,,,,,,
4Q 2006 Rank,Low-Cost Carriers,4th Quarter 2005 ,1st Quarter 2006 ,2nd Quarter 2006 ,3rd Quarter 2006 ,4th Quarter 2006 ,4th Quarter Operating Expenses $(Millions)
1,America West,13.4,11.1,12.7,14.1,13.6,978
2,Frontier,11.0,10.7,11.0,11.1,10.8,285
3,Spirit,10.6,9.5,11.5,11.7,9.4,137
4,AirTran,9.8,9.7,10.0,9.9,9.2,459
5,ATA,4.2,10.0,10.0,9.5,9.1,177
6,Southwest,8.4,8.7,8.9,8.7,8.8,"2,102"
7,JetBlue,7.3,7.8,7.8,7.9,7.9,573
,Seven-Carrier Total,9.2,9.2,9.7,9.8,9.5,"4,711"
Source: Bureau of Transportation Statistics; Form 41; Schedule P1.2.  T100; T2 Data.,,,,,,,
* System = domestic + international,,,,,,,