usatoday.com/travel/flights/ … ance_N.htm
The Best On-Time percentage is Hawaiian Airlines – 91.1%
The Worst On-Time Percentage is Comair – 68.6%
Please provide your source so we can see who is between Hawaiian and Comair. I’m interested in seeing where Southwest came in.
Sorry, forgot about that momentarily. 
Southwest did pretty good being the 2nd “Major Airline” on the list
I find these other findings interesting:
Tarmac delays: In April, there were 48 flights that had taxi-time waits of 3 hours or more before departing. American Airlines and JetBlue each reported a flight that a ground delay of 4 hours or more.
Mishandled baggage: The carriers posted a mishandled baggage rate of 3.79 reports per 1,000 passengers in April, an improvement over both April 2008’s rate of 4.99 and March’s 4.12 rate.
Customer complaints: In April, the DOT received 781 complaints about airline service from consumers, down from 1,112 in April 2008 but more than the 705 received in March.
Airline rankings: Among the major carriers, Alaska Airlines reported the best on-time rate, with 84.3%. Continental had the worst, with 72%.
Most-delayed flight:Northwest Airlines flight 803 from Atlanta to Honolulu was late 97% of the time, making it the most consistently late flight during the month.
Actually, NWA 803 doesn’t surprise me because all the Delta employees were excited to see a 747. It’s probably the most photographed flight. I’d also like to take credit for making the April 2nd version late.
Conclusion from analysis of these statistics: Fewer people flew during the month of April! 