Table 5.  System* Airline Unit Revenue (Cents Per Mile),,,,,,,
Passenger Airlines by Group ,,,,,,,
Ranked by 4th Quarter 2006 Unit Revenue,,,,,,,
(Operating Revenue Per Available Seat Mile),,,,,,,
4Q 2006 Rank,,4th Quarter 2005 ,1st Quarter 2006 ,2nd Quarter 2006 ,3rd Quarter 2006 ,4th Quarter 2006 ,4th Quarter Operating Revenue $(Millions)
1,Regional Carriers,15.0,15.4,15.2,15.0,15.0,"2,450"
2,Network Carriers,12.8,13.1,14.4,14.1,13.5,"22,868"
3,Low-Cost Carriers ,9.3,9.5,10.9,10.1,9.8,"4,842"
,21-Carrier Total,12.2,12.5,13.8,13.3,12.8,"30,160"
"Source: Bureau of Transportation Statistics; Form 41, Schedule P1.2.  T100; T2 Data",,,,,,,
* System = domestic + international,,,,,,,