iPadOS 9.3.1 (build 13E238) is an official Apple over-the-air update for the iPad Air 2 (WiFi), released on 2016-03-31T16:54:13Z. The update package is 270.64 MB. This is a delta (partial) update that requires 9.2.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: df6287ebff2542956a8fcb86109793bb4b771914.zip.