There's a lot on there that could be real but there are still some things I don't know about....
The cockpit window looks CG when it gets close towards the end.
The person flying the plan couldn't possibly keep a steady camera on the plane while flying yet when the plane is flying towards the camera in the end you don't see anyone with the controls. How could it be going 360 degrees around when the camera guy is yet you don't see someone standing or at least an antenna?

Real or fake it was pretty damn cool.