Redeemed United miles for an international flight on Air Canada with a domestic connection. I called United to add an infant, and they wanted $400 for the infant. I asked for supervisor to try reprice it, coz that's ridiculous for an economy seat. They didn't budge on price and said to call air Canada to try add the infant. But now when I look on the reservation on the air Canada site, it has my infant recorded with a ticket number. I contacted air Canada, and they say that from their end, the infant is 100% confirmed. Is there a chance they'll cancel it?