Given all of these challenges, UA still does a pretty decent job of maintaining an on-time schedule -- or, what I like to call "almost on-time." It's a good practice to follow the no connection < 60 minutes rule...but I've found that if you go with the expectation that your flight will be delayed, 6 times out of 10 you will be pleasantly surprised.

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Except when connecting to a UX flight. Schedules are at best a suggestion of when filght might maybe, possibly, eventually, sometimes leaves.