iPadOS 11.1.1 (build 15B150) is an official Apple over-the-air update for the iPad Air (Cellular), released on 2017-11-09T18:03:59Z. The update package is 1.05 GB. This is a delta (partial) update that requires 10.0.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 31b58dab38546c068049f86770185d44d5059bfa.zip.