iPadOS 9.1 (build 13B143) is an official Apple over-the-air update for the iPad Air (Cellular), released on 2015-10-21T17:15:54Z. The update package is 1.13 GB. This is a delta (partial) update that requires 8.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 289190a05ed0724b9335384960e73ac6de3e7fd7.zip.