No, do not have a specific plane factory.
Have "aircraft production facilities" as one possible target, heavily defended in each country's hinterland behind the uncapturables. Have a sliding ENY/Perk system-the more you bomb aircraft production facilities, the higher the price goes on perk planes. Unperked high ENY planes would pick up a price.
Of course, this would require a few changes. First, the ENY would be updated. It is silly that a fighter like the 109 K-4 or Yak-9U is 20 ENY, while the Ta-152 is 5. Second, I would get rid of people being ENYed out of either perk planes or high ENY planes. Instead, as I alluded to, flying them would simply involve a perk cost. Third, and this is only tangentially related, but interesting, I would give practically every aircraft except the most basic models a light perk price. Of course, I would also give each AH player a stipend of 100 perks a tour so no one would be doomed to never flying an La-7 or a Spit16, no matter how inept at earning perks.
You could do similar things for say, fuel, ammo, or ord. Bomb enough production facilities for those into the ground, and taking off with a full load could cost perks.
now if you take BnZ's idea and mix it with
then i think we would be on to something very radical and exstremely helpful to all of the major complaints of those in the game.
gives purpose to eny, helps eliviate the flood of perk rides (including gv's) will force more players to fly other rides for periods of time or to spend the perks to get the high end stuff.
if you take the eny mathematical formula and apply it as a multiplier for the amount of damage it would take to destroy one of these factories (i.e. say it takes 3000 base points of damage to destroy the factory, if you country has a downward (least player factor) eny of 20 then you multiple your factory damage rate by 2.0 (3000x2.0=6000) thus it would now take 6000 points of damage to destroy it, if your country has an upward eny (highest player factor) of the same 20 points, then you devide your factory rating of 3000 by this eny factor (3000/2.0=1500) making your factory much easier to destroy.
thus a country suffering low numbers could spare a few bomber jockies to level the playing field in planes and gv's.
FLOTSOM