iPadOS 11.3 (build 15E216) is an official Apple over-the-air update for the iPad Air (Cellular), released on 2018-03-29T17:05:51Z. The update package is 704.17 MB. This is a delta (partial) update that requires 11.0.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 797ba4c04c305a53254e9ae4a4e2ad14e5f56dba.zip.