Hello,
Umberto just wanted to mention this: When I first installed the airport and activated it, I restarted FSx and I could not see the buildings for Vol2. I downloaded the file just on the 8/8/2011. I then downloaded the stand alone Addon manager and installed it. Then the buildings were there.
Just wanted to let you know so maybe you check to see if every thing was okay with the download for Vol2.
Best regards
Edgar