Physically fit! I think Cathay is on the right track here. Not just with the physically fit statement, but their training process. It is very demanding! Every airline in the country should learn from them. Very, very few loose wires slip through the cracks over there. Not to say that it doesn't happen, but US carriers always look at training and think about dollar signs and how they can save a few bucks.
I would imagine if they would ramp up their training departments and make them worth a hoot, they would notice a decrease in cost of fighting hideous grievances and training expenditures from failed check-rides, ATC violations and much much more. Not to mention that their insurance costs would probably go down.