I have been calculating if is important or not powerlevel the fighter pilots.
As you know, "real ability" is not the same thing as displayed ability, if you level a
fighter properly, you are gaining more displayed ability, but you loose crew growth.
If you powerlevel the fighters it helps you a bit for getting more real ability.
But how much? is this important? I will put some results here.
For the calculations im using km fighters base 11/12.


-Green line is keeping them as fighters pilots.
-Blue line is keeping them as ACE fighters.
-Red line is making all the 3 upgrades.



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First calculations are made with 100 vets. (Oh, im suposing they are full of experts
too)



There is a relative difference between best and worst case of 3% on real fighter
ability that can give you like 2-3 lvl.
On aircraft the difference is bigger and it can give u more than 10lvls of advantage.
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Now calculations are made with 200 vets




Differences remain the same (more or less) for real aircraft ability.
For fighter ability differences seems to be smaller. Notice that now the best case is
the blue line.

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It seems that will be interesting putting these results in fuction on number of vets in
just one graphic.
Lets see:



No surprises for aircraft real ability, allways the green line is the better result.
But for fighter real ability ... there are alternances. In the range of vets showed,
best case is blue line.
Anyways it moves in the range of 2-4% that gives you like 2-4 lvl of advantage.
It doesnt seems a big difference ... but it exists.
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One more thing, remember that number of vets is capped at 40% of maximum crew
size (correct me if im wrong)
For a fighter that you keep as fighter pilot until lvl 120 the maximum number of vets
will be 260
For a fighter that you keep as ACE fighter pilot until lvl120 the maximum number of
vets will be 236
For a fighter that you promoted it to fighter squad leader at lvl75 the maximum
number of vets will be 218.


With those numbers of vets we have these values (ignore the X axis, it means
nothing)



Well, these are more significative differences than the others.
So if you have a lot of money to spend on game, you know what you have to do,
just make lvl40 upgrade.

(Another questions will be if exists a capp for fighter ability and how important is
aircraft ability on fighters)
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I dont understand why if there are lots of CV drivers with a lot of $$$ worried about
how to have the best fighter pilots ... noone made calculations.
I dont use to post a lot on forums, I hope u like it, and you understood my poor
english :p