I've been kind of addicted to tracking random flights around the world using flightradar24.com recently. Don't ask me why. Perhaps there's something to spying on random flights around the world. Perhaps it's because you never know what you might find.
Take this picture for example.
I was tracking a NATO flight (NATO02) as it left the EU (Belgium I think), and as it headed north west over the North Sea towards the UK and Iceland it was suddenly accompanied by a US Air Force flight (red plane shown). Around about the same time an Eurofighter jet (the red circle) left an airforce base in Scotland and seemed to be heading to wards the NATO and US AF flight. A few mintues later the NATO flight just completely vanished from the radar and the US AF airplane turned around and started backtracking itself. A few moments after taking this screen shot the Eurofighter jet also vanished around the same spot as the NATO flight did ... Weird.
Perhaps I've been watching too many conspiracy videos on YouTube lately and I need to get back to doing something productive.
Anyway, I highly recommend playing around with FlightRadar24.com for a bit. If anything it's quite shocking to see just how many aircraft are in the air at any one time.
AH