Security around planes is extremely high because the security folks believe that terrorists believe that it is a high profile target able to cause the biggest rumpus in the MSM and frighten everyone who thinks that they won’t be able to go to Magaluf for their annual holiday.
So the security people have instigated lots of checks and created lots of procedures and invented lots of new high tech equipment all to make it harder for terrorists get on a plane and blow it up.
One of the changes was to put locks on the doors to the cockpit of an aeroplane so that a terrorist couldn’t take over a plane and stop it from getting to its destination. In America, they also gave their pilots guns which they could use to stop a terrorist – when they unlocked the door to go to the loo and let the terrorist into the cockpit.
However it transpires that you don’t need to unlock the door to stop a plane from reaching its destination. All you have to do is shout “I will take this plane down!” and throw pieces of paper around which the scared air stewards will think have bomb threats written on them.