Who's Flying This Thing?

This Banshee roars over the head of the Master Chief in the Halo 3 Announcement Trailer, flying towards the mysterious buried artifact in the distance. But who is flying it? The cavity the pilot would normally appear in seems to be empty.

A delibrate omission by Bungie, to avoid revealing the species of Covenant currently invading? Or just a clever strategy to minimize the amount of artistic effort needed to create the trailer, thus ensuring the least impact on real development work?

Rampant for over se7en years.