The original iPad Air models have the same 9.7" Retina display as the earlier iPad 3rd Gen and iPad 4th Gen lines, but are "20 percent thinner and 28% lighter" and have a much narrower "bezel" around the display, which makes the iPad Air "feel" quite a bit smaller than its predecessors.
All iPad Air devices feature a 9.7" 2048x1536 (264 PPI) LED-backlit IPS touch-sensitive display, a dual-core 1.4 GHz Apple A7 processor, and 1 GB of RAM.
Other notable features include dual cameras -- a rear-mounted 5-megapixel "iSight" camera capable of shooting stills and 1080p video and a front-mounted 1.2 megapixel "FaceTime HD" camera capable of shooting stills and 720p video. Connectivity to computers, if desired, and power is provided by the Lightning port.