We're getting a lot of daft and dangerous ideas tossed in here about this. any inflatable doogeridoo filling the wheel well is going to get punctured or inflate at the wrong time one day and hazard the passengers. Tear gas will hurt someone it shouldn't one day. Raising and lowering the doors every turnaround will achieve nothing- they will run up as the aeroplane taxis away for takeoff. The only answer is security. There is no stopping them otherwise. So is there anybody else who thinks they can think of a solution in 3 minutes and wants to waste everybodies time that the industry and many aeroplane designers haven't been able to come up with so far? Ray guns.....microwave beams to heat up human bodies......?