Oblivian:

 

Fred99:

 

 

 

As for the Aus -> South America flights, before flight tracking websites, I'd seen contrails from planes at cruising altitude over Chch heading to or from the SE, wondered where they were going or coming from - it's not intuitive that a Sydney -> Chile flight should fly over Chch, yet I think even that's North of typical flight path, depending on jetstream winds they're often well South, not overflying mainland NZ at all.

 

Anywhere from wellington to half way to Antarctica is the norm.

 

It's stopped here a few times (one recently) for medical emergency enroute

 

Agree, the flight path will vary to hook onto jetstreams or avoid headwind jetstreams. They can go well out of their way to grab a free tailwind