I have been looking at this wrong airport issue and it seems to me that IF the a/c type has scheduled flights from the wrong or diverted airport the client books a carry on flight to the final (correct) destination. IF however the diverted to airport does not support the type being flown, the client sends the aircraft to its final destination automatically I guess this stops the aircraft from getting stuck at a non supported airport if the pilot doesn't take up the continuation flight within the normal 24 hrs
Maybe Joe could confirm
Atb
Dale