What was that big grey plane?

Dropping off the MIB to “negotiate” the US base in WA?

Nothing shows up here ( http://webtrak.bksv.com/cbr ) at that time, which would suggest it was Military or more likely Aliens or even Military Aliens, or maybe even Sharks with frikin Lasers!

Airbus A330.

RAAF Mid air refuel aircraft currently under development.

http://en.wikipedia.org/wiki/Airbus_A330_MRTT

Guessing it was a RAAF C-17 Globemaster?
http://en.wikipedia.org/wiki/C-17_Globemaster

Our ones are all grey and look exactly like the USAF ones except for the RAAF markings on the side.

I saw it too, it was flying low over Mitchell/EPIC at about 1:50pm. It turned and went around the other side of Mt. Majura, presumably to land.

The lack of commercial markings makes me think it was an Air force plane