iPadOS 11.3 (build 15E216) is an official Apple over-the-air update for the iPad Air (Cellular), released on 2018-03-29T17:05:52Z. The update package is 583.68 MB. This is a delta (partial) update that requires 11.2.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 82b00a9dc4020381c5efdcd1224700127413a2cc.zip.