iPadOS 11.3 (build 15E216) is an official Apple over-the-air update for the iPad Air 2 (WiFi), released on 2018-03-29T17:09:32Z. The update package is 608.58 MB. This is a delta (partial) update that requires 11.2.5 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 3b7f0692ea1b757dfa4f5223e08505f131fba6ed.zip.