I didn't say it was a problem; only that an airline touting its "95% On-Time!" figure would now be utterly incomparable to before 9/11. In fact, almost everything I've been on is "on time", due to the fact that they had built in the expected delays.
I just suspect that when the scheduling gurus get down to business again, and set the flights for maximum productivity with the equipment, then UA will be late again on nearly every flight for this route, unless there is wholesale change.