Originally Posted by
Dave Noble
BA is correct in passing you to AA. If you want to take an earlier flight, contact AA and make the change to the booking and pay any change fee/ /fare difference applicable
AA is also correct in that you would be able to do this at the airport if there is an AA ticket desk at the airport in question
You will not be able to just turn up and get on an earlier flight on the day
there is a AA ticket desk at YYZ, we’ll give it a try. Thank you