Table 9.  System* Airline Unit Costs (Cents per Mile),,,,,,,
Passenger Airlines by Group ,,,,,,,
Ranked by 1st Quarter 2007 Unit Costs ,,,,,,,
(Operating Expenses per Available Seat Mile in cents),,,,,,,
1Q 2007 Rank,Carrier Group,1st Quarter 2006 ,2nd Quarter 2006 ,3rd Quarter 2006 ,4th Quarter 2006 ,1st Quarter 2007 ,1st Quarter Operating Expenses $(Millions)
1,Regional ,13.9,13.9,13.7,13.5,14.0,"2,208"
2,Network ,13.5,13.4,13.3,13.2,13.1,"21,977"
3,Low-Cost ,9.2,9.7,9.8,9.5,9.4,"4,716"
,21-Carrier Total,12.7,12.7,12.6,12.5,12.4,"28,901"
" Source: Bureau of Transportation Statistics; Form 41, Schedule P1.2.  T100; T2 Data",,,,,,,
* System = domestic + international ,,,,,,,