Table 16: Regional Airline System* Unit Revenue ,,,,,,, Ranked by 4th Quarter 2007 Unit Revenue (Cents Per ASM) ,,,,,,, (Operating Revenue Per Available Seat Mile) ,,,,,,, 4Q 2007 Rank,Regional Airlines,4th Quarter 2006 ,1st Quarter 2007 ,2nd Quarter 2007 ,3rd Quarter 2007 ,4th Quarter 2007 ,4th Quarter Operating Revenue $(Millions) 1,Comair,16.9,18.1,18.6,19.1,20.1,311 2,American Eagle,16.5,17.6,18.2,17.4,18.7,519 3,Horizon,17.6,17.5,18.3,18.1,18.3,182 4,Atlantic Southeast,16.0,17.0,16.9,16.2,17.4,352 5,Mesa,14.3,12.9,14.5,14.4,14.8,261 6,SkyWest,14.9,14.3,14.0,13.3,13.5,514 7,ExpressJet,12.9,13.7,12.8,13.8,11.6,433 ,Seven-Carrier Total,15.2,15.5,15.6,15.4,15.4,"2,571" "Source: Bureau of Transportation Statistics; Form 41, Schedule P1.2. T100; T2 Data",,,,,,, * System = domestic + international,,,,,,, ,,,,,,,