Apple did not release an iPad Air 3 in 2015 or early 2016 like expected. Instead the company released two iPad Pro models -- the 12.9-inch iPad Pro in 2015 and 9.7-inch iPad Pro in March, 2016. You can learn more about the 9.7-inch iPad Pro Retina display and resolution here.
What is the iPad Air 3 screen resolution / size?
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