Table 8. System* Airline Unit Revenue (Cents Per Mile),,,,,,, Regional Carriers ,,,,,,, Ranked by 4th Quarter 2006 Unit Revenue,,,,,,, (Operating Revenue Per Available Seat Mile),,,,,,, 4Q 2006 Rank,Regional Carriers,4th Quarter 2005 ,1st Quarter 2006 ,2nd Quarter 2006 ,3rd Quarter 2006 ,4th Quarter 2006 ,4th Quarter Operating Revenue $(Millions) 1,Comair,15.3,16.7,16.7,17.2,16.9,283 2,American Eagle,17.4,17.1,16.9,17.2,16.5,470 3,Atlantic Southeast,15.5,15.9,15.9,14.4,16.0,320 4,Sky West,15.9,15.9,15.7,15.5,14.9,470 5,Mesa,12.7,14.0,14.7,14.9,14.3,279 6,Pinnacle,15.0,15.4,14.8,14.2,13.9,205 7,ExpressJet,13.1,13.1,12.5,12.3,12.9,423 ,Seven-Carrier Total,15.0,15.4,15.2,15.0,15.0,"2,450" "Source: Bureau of Transportation Statistics; Form 41, Schedule P1.2. T100; T2 Data",,,,,,, * System = domestic + international,,,,,,, ,,,,,,,