iPadOS 9.3 (build 13E237) is an official Apple over-the-air update for the iPad Air (Cellular), released on 2016-03-28T16:51:29Z. The update package is 1.09 GB. This is a delta (partial) update that requires 8.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 4120b1f035ab54f322f85df4db650f50a445eee5.zip.