iPadOS 11.3 (build 15E5211a) is an official Apple over-the-air update for the iPad Air (Cellular), released on 2018-03-12T17:05:22Z. The update package is 195.26 MB. This is a delta (partial) update that requires 11.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 87e17fae4711260ca948b0e73e3ae247651f4bdf.zip.