Well look at the controversy over the recent pole, where the Meteor is obviously going to win
It is true that there are a lot of holes in the plane set and probably more deserving additions to be added first (and of course HTC might be doing that without telling). Ideally the Early, Mid War and AvA arenas should all be as populated as the Late War arenas, all the time, and scenarios would be all the more richer without the substitute aircraft. We can all probably rattle off a dozen aircraft which AH should really have already, the He111, The Ki-43, etc. etc. That whole lot would have to be worked through even before we could consider some of the rarer and yet still interesting aircraft, small numbers fielded, all of the combatant countries represented etc.
It is painfully slow process however, people get frustrated waiting over ten years for their favourites and the whole community is bickering over what should be added next, competing for a finite resource. As far as I know player contributions have never so far extended beyond Skins and Soundpacks.
There is a huge fan base here who want these planes and more than willing to do as much research and gather all of the information and photographs necessary, even going to any museum in the world and taking the time to make detailed shots, ask questions, gather documents and so forth. Creative aircraft fans, sticklers for the minutest detail, painstaking researchers and people who would voluntarily donate many hours of careful work
for free to make the whole game richer for everyone.
Speaking personally for instance, I would much rather spend my hours making the 3d models for an Aces High version of the Westland Whirlwind (for example) than building a super detailed plastic scale model of the same (and I have considered doing that). It'd still be an enjoyable creative process, would be more useful to me because I'd one day get to fly the simulated version in this great game and finally it would be more useful to other players who could use it too.
Presuming HTC has no objection to having an even richer plane set, why not discuss possibilities to tap into this huge resource?