Talk:Akashi's Improvement Arsenal/@comment-31999758-20170527113332/@comment-26155909-20170527120623

Maybe others can give you better advice, but i'd say:

- proto 41

- 20.3 n°2 and 20.3 n°3

- fighters planes (types 21 skilled and named squadrons)

Note: improvement carry over when doing plane convertion quest and is cheapper on the base plane rather than the upgraded one. This is most important if you haven't done the quest to change a type zero 52C (601 air group) into a reppu (601 air group), because the reppu cannot be improved.