Table 12. Airline Domestic Unit Costs (Cents per Mile),,,,,,, Regionals,,,,,,, Ranked by 4th Quarter Domestic Unit Costs ,,,,,,, (Domestic Operating Expenses per Available Seat Mile in cents) ,,,,,,, 4Q 2004 Rank,Regional Carriers,4th Quarter 2003,1st Quarter 2004,2nd Quarter 2004,3rd Quarter 2004,4th Quarter 2004,4th Quarter Operating Expense $(Millions) 1,American Eagle,13.5,14.8,14.3,14.2,14.6,339.4 2,SkyWest,12.8,13.2,13.4,13.2,13.8,289.9 3,Atlantic Southeast,12.0,12.2,12.0,12.3,13.3,238.9 4,Comair,10.9,11.6,11.5,12.2,13.3,297.9 5,Pinnacle,N/A,14.6,13.7,12.9,13.1,163.8 6,Express Jet,12.9,13.4,12.6,12.7,12.5,309.8 7,Mesa,N/A,11.8,10.3,10.8,10.9,212.1 ,Seven-Carrier Total,N/A,13.0,12.5,12.6,13.1,"1,851.8" "Source: Bureau of Transportation Statistics; Form 41, Schedule P1.2. T100; T2 Data",,,,,,,