What I don't understand is what somebody else pointed out on here. If this guy was planning on crashing the plane then how could he have been so "fortunate" as to have found the time that the pilot needed the loo to do it. In a short flight then surely there's a chance that the pilot would have remained in his seat the entire time.
If this guy was suicidally depressed then what was he doing? Waiting for the perfect storm of being overcome with a wave of depression, being in charge of a plane and having the pilot need a wee all at the same time It seems like a lot of planning for someone who was obviously thinking irrationally - do you think the pilot gave him a bollocking for something just before he downed the plane?