deetee, I had a similar problem with transparent buildings a while back, and always at arrival airport. This fixed it for me; it might help with your particular problem.
Go to your FSX.cfg file, and firstly Back it Up; somewhere safe, perhaps just on Desktop.
Under [GRAPHICS] heading add this line:-
If this dosn't help, then either remove or replace with backup
Thank you that works much better, all is visible again on arrival!
Funnily enough I had this line in a while back, but I must have rebuilt my fsx.cfg and forgotten to put it back in.