iPadOS 11.3 (build 15E216) is an official Apple over-the-air update for the iPad Air 2 (WiFi), released on 2018-03-29T17:09:31Z. The update package is 615.19 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: f39193bc99f9d71ed76803e1ea73e9fbdd656951.zip.