iPadOS 9.3.1 (build 13E238) is an official Apple over-the-air update for the iPad Air (Cellular), released on 2016-03-31T16:52:47Z. The update package is 284.51 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: 181f7f1046b11015cd2c5df26994b863a7e854b1.zip.