N789EX —

I wonder why this Boeing is not painted in Air New Zealand colours?

Leon - Take a look at the other photos of this aircraft's FAA registration number... apparently the livery this one is showing in the above photo was Boeing's "house" demo colours prior to this 787-9 being exported to New Zealand.

That FAA registration number was cancelled in 2015...

http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=789EX

notice the drogue and skid plate.