Maybe most horrifying is that the passengers would have been aware that something was wrong because they would have seen the locked-out pilot swinging an object

Maybe most horrifying is that the passengers would have been aware that something was wrong because they would have seen the locked-out pilot swinging an object against the door. There supposedly exists [footage](https://www.theguardian.com/world/2015/apr/01/germanwings-passenger-video-authentic-paris-match https://www.theguardian.com/world/2015/apr/01/germanwings-pa...) that passengers recorded of the plane's final moments with their phones, which survived the crash.