Board Thread:Fleet's Prepared-ness/@comment-33564057-20180513124540/@comment-27633922-20180513175417

I recommend you read this guide:
 * Small Savings For Improving Type 0 Fighter Model 21/52

It'll help you avoid wasting both Improvement Materials and Improvement fodder for improving aircraft.

You can also try farming Hiryuu and/or Souryuu to get extra T0FM21(S) per month, after doing quest conversions. I recommend you get 6 of these improved to MAX for LBAS use. They'll allow your LBAS to get the best out of the Zero's long range and high AA stat.

After that, do conversion quest to get the T0FM52(S), these will become the backbone of your carriers alongside Iwamoto and Iwai Fighter (both of which should already be MAX by this point).