I guess I am relating this to what happened at Barton at the respective heights that certain aircraft manage to achieve by the time they get to the end of 09.
Some of the older types stuggle to get to a safe height AND have brick like glide potential in the event of something going wrong.
It was said on the other thread that 09 departures have always been a risk and yet if you can get up to 400' or so before you get over the threshold as opposed to labouring up to 150' then you kind of have a better insurance policy.