Useful links https://www.caa.govt.nz/script/aircraft-register-query/
Jetphotos is a Photo Database Which Flight Radars use!
The CAA is the New Zealand organisations how to make rules and regulations for NZ flying!
Step 1: Hmm Some intresting aircraft registrations, I think the CAA would have some intrest in
https://www.jetphotos.com/photo/9268320
https://www.jetphotos.com/photo/9370078
https://www.jetphotos.com/photo/9306598
https://www.jetphotos.com/photo/6314354
ZK-MBS
https://www.jetphotos.com/photo/9261813
https://www.jetphotos.com/photo/9358158
ZK-MDX
https://www.jetphotos.com/photo/7081530
https://www.jetphotos.com/photo/9336599
ZK-CXL
https://www.jetphotos.com/photo/9329791
ZK-GMW
Step 2 (Use list from above): Those 3 sets of letters are random maybe ask the CAA (https://www.caa.govt.nz/script/aircraft-register-query/)
Second digit Of Serial Number
Third Digit of Flight Manual Number
Third digit of the Make of this aircraft
First Digit of the make of this aircraft
Fourth Digit of the serial Number
Third Digit of Make
Second Digit of MCTOW
First and Second Digits of Make
6th digit of serial Number
3rd and 4th digit of MCTOW Reversed
First digit of serial Number
4th digit of serial Number
Second digit of MCTOW
N.B All Digits are Correct as of the 29.8.19