Table 9. Airline Domestic Unit Costs (Cents per Mile),,,,,,, Passenger Airlines by Group ,,,,,,, Ranked by 1st Quarter 2004 Domestic Unit Costs,,,,,,, (Domestic Operating Expenses per Available Seat Mile in cents),,,,,,, Rank,Carriers,1st Quarter 2003,2nd Quarter 2003,3rd Quarter 2003,4th Quarter 2003,1st Quarter 2004,1st Quarter Operating Expenses $(Millions) 1,Regionals,15.16,13.54,12.99,12.94,13.61,"1,582.5" 2,Network,12.77,12.15,11.70,12.32,12.55,"14,625.8" 3,Low-Cost,7.56,7.49,7.33,7.49,7.62,"3,072.1" ,21-Carrier Total,11.72,11.15,10.77,11.22,11.44,"19,280.4" Source: Form 41; Schedule p1.2. T100; T2 Data.,,,,,,,