Yea, here are the numbers from the governemnt:
(January 1 through Spetember 1 2006)
SkyWest average Departure Delay: 7 minutes
Mesa average departure delay: 14 minutes
SkyWest Cancelled: 1.73%
Mesa Cancelled: 3.18%
SkyWest late flights: 19.74%
Mesa late flights: 23.04%
Not much difference, but some.