When UK airports shut the stable doors after the horses had bolted and stopped vehicles getting close to terminals I always wondered what would stop suicide bombers detonating suitcases full of explosives in a crowded check-in area. Let's face it, it's not suspicious carrying a suitcase into an airport departures area - and in the UK there's no security prior to entering a terminal. It doesn't stop me travelling but I do think about it. This incident has highlighted my concerns.