Not a lot of info out there on that. It's possible they don't use them.
They all share a common DNA though, and 10-5 seems to mean "relay" or "relay to".
http://wiki.radioreference.com/index.php/10_codes
I sometimes follow foreign military over CONUS but can't easily with my setup where I am at the moment. I set a filter to country not United States.
It's not wholly unusual to see foreign military over CONUS. Only if they're not allies kek
Australia seems to by far an away have the most traffic (excluding Canada crossing over, but you don't usually see a lot of Canada deep in the country).
Around New York it's very common of course (UN) , as well as Virginia (___)
Honolulu is a logical refueling point for Australia I would think.
And yeah that frog plane does look weird. Sightseeing?
Aussie flights have been going on as long as I've been monitoring anon (well over a year).
I think they did some air refueling training late last year mid continent, but there's always (roughly weekly) flights of transports from Aus to San Francisco then off up North. They could just be passing through to Canada I suppose. But as to why they would need to, who knows?
I've also seen them go from west to east coast then off up north east.
Maybe the BoE gave them their gold back? Kek
Coulda been burning fuel.
You want we stop taking about these things?