Not sure if this is the correct place to post this but since AC is the first carrier on the initial ticket I'm posting here. Flying YEG-YVR-SFO-HKG on a UA ticket with the first leg on AC and then HKG-TSN on CA. I am wondering if UA or AC policy applies to baggage on this ticket as United allows through checking bags on separate tickets on alliance carriers while AC seems not to based on the responses in the thread. The two tickets also have different baggage allowances so does the higher or lower one apply?