I posted this in another thread, but I found an itinerary completely re-routed - instead of SFO-IAH-DFW (on mainline UA/CO), they changed me to SFO-LAX-DFW on a mainline on the short run to LAX, then UX from LAX to DFW! No notice whatsoever. I got them to change it back -- but this was not even noted in red as a schedule change like something like this usually appears on my reservations page.