Originally Posted by
Kiwiconehead
Are you sure they are not just exiting FR24 coverage off NZ at 35000 and then being at 25000 when they reenter coverage close to Aus?
There isn't coverage all the way across the ditch.
This is the answer.
I use Flight Aware and it has a similar issue.
Example: NZ855 WLG - MEL on the 12th June (local).
The last ADSB data point departing NZ is at 0658 NZST at FL320. The next data point is nearly two hours later at 0851 NZST at FL260. The graphical plot shows a gradual descent between those two points but the flight was actually planned to maintain FL320 until waypoint GILLY where it was planned to descend to FL300. Another descent was planned at LEPAR on the Melbourne FIR boundary to FL260.