Hi!
Don't forget the Civilian pilots with COMBAT time, which are becoming more and more prevalent.
Barriers?
We don't knee any. There is a BIG shortage of pilots right now, and it's getting worse and worse because less and less people have the money/ability to get loans to do flight training, vs. the motivation of the career expectations.
Obviously, there's no physical pilot shortage TODAY in the US, but that's because Age 65 just happened to change at the same time there was this economic down-turn. Once the Age 65 thing is sorted, the airlines will be begging to make the training quicker/easier/cheaper so they can fill their pilot seats, even here in the US.
cliff
GRB