I don't have any personal experience, but UAL decided to go w/ the Airbus and retire the entire 737 fleet, though those are the classics. It will be interesting to see what prevails in the DAL/ NWA merge with the NG -700's and -800's. I have a feeling DL will stick w/ Boeing on this if they had to pick. Also, Frontier used to be all 737's and are now all Airbus, but again those 73's were classics. So it looks like Airbus is winning vs. the old 73's but vs. the new 73's might be harder to tell yet. Can't think of any airline that operates both the A-320 family AND the 737 NG. Anyone?