Art and Animation Studio recently completed Goat Story:  The Legends of Old Prague, the first CG Czech film.  The entire movie was rendered with AIR via MayaMan from Maya using only 10 computers.  The Autodesk AREA web site has an interview with filmmaker Jan Tománek who had this to say when asked why AIR was chosen for rendering:

The reason behind our choice is that with both mental ray and the native Maya software renderer, it was not possible to render our huge scenes. There were approximately around 4 million triangles and between 4-5GB of textures. In mental ray, it would output just one "render square" and crash because it ran out of memory. In AIR, we simply clicked on 'Render' and everything was done. Perfect.