Originally Posted by Globaliser

Two linked answers:-[list=1]It is perfectly practicable to have such security checks for airline passengers. It is not practicable to do this for every other mode of transport.

Originally Posted by Globaliser

Airliners are uniquely vulnerable to attacks by explosives in a way in which other forms of transport are not. I don't mean to downplay the scale of the loss of life and injury in the metro train attacks in Madrid and London, but you have look at how much had to be done by the attackers to get those casualty figures. A tiny proportion of that effort would have brought down an airliner.