iPad Air I found this on Apple.com

[TechElliott]

I was looking through Apple's iPad pages and I found this:

The iPad Air's screen is 10.9 and 12.9, not 11 and 13

 

[oneMadRssn]

I was looking through Apple's iPad pages and I found this:
View attachment 2375830 View attachment 2375831
The iPad Air's screen is 10.9 and 12.9, not 11 and 13

This has been the case for a while as to the 11-inch, going all the way back to the 1st-gen 11-inch iPad Pro.

The resolutions are also not the same:

iPad - Compare Models

Compare resolution, size, weight, performance, battery life, and storage of iPad Pro, iPad Air, iPad, and iPad mini models.

www.apple.com