I saw something funny last night myself.
I have a better explanation than aliens from another planet.
I think there is a lot of undocumented military traffic in the skies over Australia. In fact, I think Australia is used by the United States as a testing lab for most of their newest equipment.
There's a reason the Stealth Bomber was declassified. It's because America got something much better. I think that is what a lot of these folks are seeing out West.