Originally Posted by francophile
One option:
1) Book a the following J class AAward for your grandmother:
JFK-LHR (AA)
LHR-PRG (BA)
2) For you, buy a coach ticket for the same itinerary as your grandmother. Then use your e-vip to upgrade the inter-continental portion of the itinerary.
The only other option I can see is to fly AA to Dublin and connect to AerLingus to PRG. AerLingus does not have business class(DUB-PRG), but at least you get to sit with your grandma for the entire trip, which she may enjoy more than sitting by herself in the "business" class on BA for the short hop, which is nothing more than a economy seat with the the middle seat blocked. Also, DUB is a great deal smaller and more manageable airport for transfers.