Hi there,

I have an return Aeroplan reward ticket booked in J from YYZ to GRU. My outgoing flight is on UA from YYZ to ORD then ORD to GRU with return on AC from GRU to YYZ.

There is a direct YYZ to GRU and I was wondering if it was possible to to a same day change to that flight is there was room in J. I know this is sometimes possible with flights on AC, but not sure if it complicates things that the flight I am trying to change is on UA. Also, the AC flight I would like to change it to leaves after my currently booked flight from YYZ to ORD.

Any help with this is greatly appreciated. Thanks!