Table 13. Domestic Passenger Revenue Yield (Cents per Mile),,,,,,, Passenger Airlines by Group ,,,,,,, Ranked by 2nd Quarter 2006 Domestic Revenue Yield ,,,,,,, (Domestic Passenger Revenue per Revenue Passenger Mile in cents),,,,,,, 2Q 2006 Rank,,2nd Quarter 2005 ,3rd Quarter 2005 ,4th Quarter 2005 ,1st Quarter 2006 ,2nd Quarter 2006 ,2nd Quarter Passenger Revenue $(Millions) 1,Regional Carriers,19.4,19.6,20.4,20.6,18.9,"2,430" 2,Network Carriers,11.9,11.7,12.2,12.7,13.1,"12,236" 3,Low-Cost Carriers,10.8,10.6,11.2,11.4,12.1,"4,564" ,21-Carrier Total,12.3,12.1,12.7,13.1,13.4,"19,230" Source: Bureau of Transportation Statistics; Form 41; Schedule P1.2. T100; T2 Data,,,,,,,