Table 9: Passenger Airline System* Unit Costs ,,,,,,,
Airline Groups Ranked by 4th Quarter 2007 Unit Costs (Cents Per ASM) ,,,,,,,
(Operating Expenses per Available Seat Mile in cents),,,,,,,
4Q 2007 Rank,Airline  Group,4th Quarter 2006 ,1st Quarter 2007 ,2nd Quarter 2007 ,3rd Quarter 2007 ,4th Quarter 2007 ,4th Quarter Operating Expenses $(Millions)
1,Regional ,14.1,14.7,14.9,14.7,14.9,"2,478"
2,Network ,13.2,13.1,13.4,13.6,14.5,"25,909"
3,Low-Cost ,9.6,9.3,9.6,9.6,9.5,"4,304"
,21-Carrier Total,12.5,12.4,12.7,12.8,13.6,"32,692"
"Source: Bureau of Transportation Statistics; Form 41, Schedule P1.2.  T100; T2 Data",,,,,,,
* System = domestic + international,,,,,,,