iPadOS 12.1.3 (build 16D39) is an official Apple over-the-air update for the iPad Air (WiFi), released on 2019-01-22T18:03:58Z. The update package is 211.67 MB. This is a delta (partial) update that requires 12.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 4e5b3dfd212d760fd64934004200d8e55189467d.zip.