pilot of germanwings flight 9525 can be heard banging hard on the door people have been asking how they have not found a way to smash into the door. since 9/11 doors have been drastically reinforced. we sent stephanie elam to find out. reporter: we have given you the vantage point. the cockpit door here is a slim door. don t let that fool you. you have the peep hole. more security to the door. i hope want to take you outside and introfantentroduce you to the captain. what would it take to break down this door? probably more than a grenade. it has been tested with a grenade against it and it did not open it. reporter: it is a fortified