Table 1: System* Quarterly Operating profit/loss margin (in percent),,,,,,,
Passenger Airlines by Group ,,,,,,,
Ranked by 2nd Quarter 2007 Margin ,,,,,,,
(Operating Profit/Loss as Percent of Total Operating Revenue),,,,,,,
2Q 2007 Rank,Carrier Group,2nd Quarter 2006 (%),3rd Quarter 2006 (%),4th Quarter 2006 (%),"1st 
Quarter 2007 (%)",2nd Quarter 2007 (%),2nd Quarter Operating Profit/Loss $(Millions)
1,Network ,7.5,5.4,1.7,2.5,9.2,"2,406"
2,Low-Cost ,10.8,3.3,2.3,2.3,8.1,451
3,Regional ,8.1,8.9,10.0,6.3,5.7,143
,21-Carrier Total,8.1,5.4,2.5,2.7,8.8,"3,000"
"Source: Bureau of Transportation Statistics; Form 41, Schedule P1.2 ",,,,,,,
* System = domestic + international,,,,,,,
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