I still don't see how Air NZ can do it cheaper than SQ by ferrying a 744 empty to SIN, ferrying the troops to ROK and back then ferrying the 744 empty to AKL.
AirNZ commonly offers cheap staff travel specials on the ferry sectors. For this trip, $250 & $350 return fares + taxes were offered to staff. Not sure how many took up the offer.
S2K