iPadOS 11.3 (build 15E216) is an official Apple over-the-air update for the iPad Air 2 (Cellular), released on 2018-03-29T17:10:04Z. The update package is 608.53 MB. This is a delta (partial) update that requires 11.2.5 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 857c791eea7514e71c3c1a352c325b7b2d605664.zip.