iPadOS 11.3 (build 15E216) is an official Apple over-the-air update for the iPad Air (WiFi), released on 2018-03-29T17:05:46Z. The update package is 578.01 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: cf7a2947d010bd3dd687d8c9951842fb0c9ebd6e.zip.