I seem to recall that UA.com used to list each flight's on-time performance % when searching the flight schedules. I took a quick look today, and they don't seem to offer that feature any more, but I would love to see it added to CO.com!

It really would save a lot of time to not have to launch an external site and look up each flight number's historic data. I realize that I'm stating the obvious, but access to this data sure makes it easier to estimate if the connection time is going to be sufficient. I hope they aren't intentionally avoiding publishing these figures to save face. As an airline catering to business travelers, this should be a welcome feature for their most valued customers.

On another note, I'm glad I'm not flying Delta partner flights!
Feel like your flight is always late? If it's Delta, it could be ... again

What I'd love to see would be a probability next to each connection: This would be far easier than e.g. weather forecasting, which we all take for granted. I wish that consumers demanded such information as a matter of course.