iPadOS 12.1.1 (build 16C5043b) is an official Apple over-the-air update for the iPad Air (WiFi), released on 2018-11-07T21:08:20Z. The update package is 261 MB. This is a delta (partial) update that requires 12.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: d48964293b22c4d50b641495c4adf519effb2a11.zip.