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What questions do you have about the crash? Post on Twitter with the hashtag #GermanwingsQs. We'll take them to aviation experts and try to get them answered.
My wife suspected this from the beginning because there was nothing much to give alarm because airspeed and declination was maintained throughout the flight after reaching an altitude of 38,000. So, the first to be alarmed was the captain when the co-pilot wouldn't let him back into the cockpit. However, cockpit doors are designed now to keep out everyone if the present pilot locks it and doesn't open it for the other pilot returning from a bathroom break or whatever. So, likely even if the pilot returning had an axe he couldn't have gotten through the door. A bullet through the locking mechanism likely wouldn't have done it either. So, whether the person in the cockpit was having a bad day, or whether he was drugged or whether he was unconscious there was no way the returning pilot could solve this problem.
One way to solve this problem might be to put a bathroom inside the pilot's door on a plane so a pilot doesn't have to leave the cockpit except for other reasons. This way if either pilot has a problem physically or otherwise they can fight over the controls at least if necessary or one of them can open the cockpit door and let other flight attendants in to help in landing the plane safely. Also, imagine if both pilots received a meal that poisoned them. However, I know that airline pilots are required to order different meals to help avoid this problem.
One by one answers to all of the known potential problems to keeping planes and passenger planes safe in the air and on the ground are being found.