Talk:Type 1 Land-based Attack Aircraft (Nonaka Squadron)/@comment-115.74.26.112-20171217224058/@comment-3502824-20171217224933

You just answered your own question. Yes it's an event-only reward.

You may still obtain Type 96 Land-based Attack Aircraft through Development, Quests F37, F38, and Type 1 Land-based Attack Aircraft from Quarterly Quest, while Type 1 Land-based Attack Aircraft Model 22A comes from Quest F40.