iPadOS 11.4 (build 15F79) is an official Apple over-the-air update for the iPad Air (Cellular), released on 2018-05-29T17:13:08Z. The update package is 1.24 GB. This is a delta (partial) update that requires 10.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 8bfafcc05159e491eee97d9311b1061ec9166dc1.zip.