I booked with AC to travel from Canada to the UK at Christmas. We are then visiting people around the country and booked to fly out of a different city back to Canada (same ticket).
YYC -> LHR (layover) -> ABZ
return is just LHR -> YYC
All flight are booked and operated by AC except the one LHR->ABZ flight which is operated by BA. it's not codeshare, we have to check in at the BA desk in LHR.
Basically, we don't need to go to ABZ anymore, so we phoned AC, they said cost to change was xxx (alot) but the best thing to do is just only check your bags to LHR (tell AC rep at YYC this when you check in) and pick them up in LHR, don't use the BA portion to ABZ. I asked if i would then still be able to check in for my return trip as sometimes i've heard of people forfeiting the rest of the ticket including the return portion. He said it's not an issue here as my return is from London. Of course there is nothing in writing but I wondered if anyone else had a similar experiencing..