nwa newswire reported these stats for December:

Order: Ontime Perf., Bag. Hand., Consumer Complaints
US Airways=84.6 (1) 2.52 (1) 1.09 (6)
Delta=83.6 (2) 3.04 (4) 0.56 (2)
Northwest=79.8 (3) 2.92 (3) 0.44 (1)
Continental=78.7 (4) 2.91 (2) 0.67 (4)
American=77.2 (5) 3.76 (6) 0.72 (5)
United=74.7 (6) 3.37 (5) 0.59 (3)

Number one in consumer complaints, #3 for the other too. Not too shabby. It also reported december traffic as you stated.