All pointless.
Next time it will be you at work in the flightdeck, a mobile phone picture message showing a terrorist with a Stanley Knife at the throats of your kids, and a voice telling you unless Canary Wharf goes down in the next hour then they do.
My advice? Don't start trying to think hard about security and terrorism. If you do you'll realise its all window dressing and emigrate.
Cheers
WWW