What is the definition of a terrorist, someone who seeks to strike fear into the hearts of people by carrying out an extreme act that causes death and destruction. That is what the pilot of the Germanwings plane did, he deliberately flew the plane into the mountain, killing 150 people and thereby terrorizing all of us who fly. No one has compared it to the act of the hijackers who flew two commercial planes into the Twin Towers in NY on 9/11, but it is in fact exactly similar. The main difference is that the German pilot Andreas Lubitz was not a Muslim Arab and did not act out of religious fervor or political motives, but he was a terrorist nonetheless.
This leaves us with a dilemma, the door to the cockpit in all commercial aircraft are now locked during the flight to prevent access by terrorists, and the doors are also reinforced to prevent them being broken down. In the case of this crash the captain left the cockpit and the co-pilot Andreas Lubitz pressed an over-ride switch to prevent the captain returning to the cockpit. So you can’t have it both ways, or can you? Now it is required on all flights that there always be two people in the cockpit at all times, so that if the captain or co-pilot leaves the cockpit for whatever reason, someone, a steward or stewardess, must substitute for them. We could also remove the over-ride button in the cockpit so that the captain could never be prevented from returning, but in that case a terrorist could take the captain hostage and force him to open the door or else he would shoot him.
Another suggestion is that planes could be controlled electronically from the ground, thus preventing pilots from going berserk. But, the problem with this approach is, can you imagine a terrorist organization, supported by a state, taking over the electronic control of a plane and deliberately crashing it. I know you could say well it would have high security with passwords etc. But what man can invent, other men with ingenuity can take over. There is no end to the speculation, whatever you think up, the terrorists could win.
A report (or rumor) that during his 6 month health break from his pilot training that Lubitz became a radicalized Muslim has not been confirmed. In the final analysis, Andreas Lubitz was right, he told a former girlfriend that he would force them to re-write the book on how planes are run, and he managed to do that by deliberately and coldly putting his plane with 150 aboard into a steep descent into a mountain. If he was depressed the least he could do was kill himself and spare his passengers.