The outside door to the electronic bay under the pilot compartment is UNlocked and accessible to any crew from outside. Even a small explosive device placed inside the electronic bay compartment will bring down an aircraft such as this Airbus model because it is all electronic controls and there is no option for pilots to fly the plane manually.
A manual override would require extensive mechanical components reaching all wing and rudder controls, which adds significantly to manufacturing cost AND increases weight of the airplane, thereby reducing cargo capacity and fuel mileage. Airplanes such as this Airbus model are so popular because of their excellent fuel efficiency and low cost.
I was a corporate flight attendant for a private company and when we flew to the Middle East, a private security firm was used on the ground. Armed guards would guard our plane which was parked far away from the other jets.
There are too many infiltraters at commercial airports and anyone can get something on a plane - catering, cleaning staff - and I don’t know if all crew members in different countries working for different airlines are required to go through security, so, there is that.
Blow one up and buy another cheap. Increase ticket price......
“Airplanes such as this Airbus model are so popular because of their excellent fuel efficiency and low cost.”