Originally Posted by
eigenvector
I guess the schedule change never showed up in UA's systems under the codeshared flight number. I have seen this a number of times on YVR<>SFO. UA shows completely wrong times for codeshared AC flights even up to the day of departure and allows booking of impossible connections as a result. Lesson learned: always check the operating airline's website when booking interline or codeshare connections with UA.
I wonder if the OP is entitled to compensation?