Talk:Akashi's Improvement Arsenal/@comment-26107364-20150610150202

I think the reason we haven't gotten planes yet is that Improvements rarely involve cross-model upgrades (ie. Zero52's into either Shiden or Reppu) and more along the lines of infra-model upgrades (ie. Zero52's into Squad601Zero52's)

but such upgrades would either be outdone by a craftable (Reppu outdo just about any other fighter) or be pretty broken (ReppuKai are limited edition fighters for a reason)

and it's not likely that they'd give us the Reppu upgrade since a good number of Improvements are for gear that is usually thrown out; so we'd be left with improving to 601 or Skilled.