iPadOS 9.2.1 (build 13D15) is an official Apple over-the-air update for the iPad Air (Cellular), released on 2016-01-19T17:59:23Z. The update package is 234.3 MB. This is a delta (partial) update that requires 9.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 53eee51393530007beff4ce0970cbfbf80f8cc43.zip.