Do the helicopters also carry a
"As you appear not to be following me is there any chance you could let us know where you're off to?" sign?
Or a
"Whilst I'm sure that you've thought this through, have you considered what happens to a helo upon impact with anything?...The chances are you will crash into all sorts of things but not your intended target." sign.
Or maybe even a
"If you'd worked harder at school you could have hijacked a real aircraft." sign.
