I believe you use world relative, you won't be able to sit in the gunner position, but certainly near it.
Select a position you want to start from and grab the starting position data, and then just change the angle of the camera at the ending position (do not use the arrow keys as this will physically move the camera on the ground, use the keypad numbers to change the viewing angle of the camera).
^ This may sound confusing.
In this short film, I used the world relative for the the fly by section during the time frame: 37 seconds to 42 seconds. However, unlike the shot you're requesting, I moved the camera (using the arrow keys) as well as the angle.
http://www.youtube.com/watch?v=fYr850iBCEkPlane relative using the plane as a center of focus for tracking. World relative does not have a center of focus.