iPadOS 11.3 (build 15E5189f) is an official Apple over-the-air update for the iPad Air (Cellular), released on 2018-02-20T18:06:11Z. The update package is 290.78 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: 9f01b310b62e9abceb6dda5af9267baedc36c4c7.zip.