Correct me if I'm wrong, but united.com itself does not provide delay data for city pairs where it deems it has insufficient history due to flight number changes, and surely for the unsophisticated traveler, who are the majority of visitors to united.com, that's the first and probably only place they are going to try to look. How convenient that CO does not need to display ontime data at the time of sale for a large fraction of trips. Sure, if Pax Kettle knows about and decides to go to the DOT site, etc., he/she can dig out the truth.