runway behind is no benefit
I am not into FLEX as a matter of principle.......
In general in corporate it is available, and sometimes used, but the economics in my opinion do not justify it.
I prefer the shorter roll, on the typical corporate airports. I prefer to limit the bumping to the gear, as well as the passengers. I prefer air under the wings creating a margin of safety. I prefer the hills to be below me, and not exactly at my computed level, in that first turn.
I will not do flex, when there is a heavy infront, I want to well inflight before ant residual turbulance.
Would it be fair to say that a derated engine core, benefits less from a FLEX take off, and thus negated the standard arguements.
I did a flex about two years ago, at Stansted......
glf