We were at a BBQ yesterday in Wellington when an enormous grey plane flew overhead. A bunch of us checked FlightRadar but no sign of what it was (and in fact no sign of anything in the air near Wellington at all, even the following AirNZ flight)
Turns out it was a bunch of US security officials in town:
https://www.nzherald.co.nz/nz/news/article.cfm?c_id=1&objectid=12170455
Weird how they seemed to have control on FlightRadar?!