With due respect, I think such an arcane question needs to be directed to either Air Canada's Aeroplan centre or SK directly. Under normal circumstances code shares are iffy when flown by non-STAR Alliance carriers and must be booked in a certain way. This particular situation involves so many other variables — it is not an airline flight, it is not operated by a STAR alliance or any other IATA carrier — that you would have to get a ruling in writing from some true authority, not just us. UA has a couple of such "flights" on buses and they may indeed count on STAR partners. LH has similar "flights" on German railways but I have never heard of Aeroplan giving them credit, though UA does. There is usually a listing of such inelligible "flight" numbers somewhere.