When I run as administrator, neither the airports or the game itself ask me to activate. However, once I go back to running as a normal user, I get all the activation requests. I guess I'll have to set it to run as administrator permanently. I still wonder what's causing the problem, however. I'm thinking about using the FSX installer to repair the game but I'm not sure if that will cause any damage to the addons I have installed. If I did that, I wouldn't know which installer to use (FSX Disk or SP2 installer). I noticed that when I run the SP2 installer, the "Repair FSX SP2" is grayed out while the "Remove FSX SP2" option is available.
Either way, thanks for getting it to work Umberto,
Ethan.