Gameloft recently released a new iPad book-app, Warplanes: A History of Aerial Combat (US$6.99). This app is follow-up to Gameloft's earlier book-app, War in the Pacific. This latest offering includes detailed information on 43 historic war planes including popular bombers like the B-52, fighters like the F-15 and reconnaissance airplanes like the SR-71 Blackbird.
You can view a 3D model of the plane, browse vintage photographs, read detailed specs and even watch a video of the plane in action (though not all planes have a video). The app opens to a home screen with clickable images of all the planes and is organized as reference guide, not a chapter book that you read.
The content is organized nicely and there is a lot of information for users to comb through, especially if you are new to military aviation. Besides background information, there is an interactive cutaway diagram of each plane and a rotatable 3-D model. The 3D model is a bit disappointing as you can only move it left and right. You cannot spin it to see the top and bottom of the plane.