Table 9.  System* Airline Unit Costs (Cents per Mile),,,,,,,
Passenger Airlines by Group ,,,,,,,
Ranked by 4th Quarter 2006 Unit Costs ,,,,,,,
(Operating Expenses per Available Seat Mile in cents),,,,,,,
4Q 2006 Rank,,4th Quarter 2005 ,1st Quarter 2006 ,2nd Quarter 2006 ,3rd Quarter 2006 ,4th Quarter 2006 ,4th Quarter Operating Expenses $(Millions)
1,Regional Carriers,13.6,13.9,13.9,13.7,13.5,"2,205"
2,Network Carriers,13.7,13.5,13.4,13.3,13.2,"22,475"
3,Low-Cost Carriers ,9.2,9.2,9.7,9.8,9.5,"4,711"
,21-Carrier Total,12.8,12.7,12.7,12.6,12.5,"29,391"
"Source: Bureau of Transportation Statistics; Form 41, Schedule P1.2.  T100; T2 Data",,,,,,,
* System = domestic + international ,,,,,,,