It is a sad fact that some of these aircraft " enthusiasts " do bring problems upon themselves, sometimes going where they shouldn't just to get a " better picture " to show off on some aviation website. When Obama visited London some of these very clever prople were able to demonstrate and openly publish their ability to track Airforce One across the Atlantic giving precise info on location ETA and flightpath etc. Your average terrorist would have had all the info to carry out an attack on Airforce One with great ease methinks.