I did that recently but to Seoul. Return via SIN. Pain in the cough. Extra hours in airports and planes, boarding. I was over it by the time I was getting on the connecting flight in Singapore knowing that if I went direct I would have been arriving at my destination already. All in economy and their lines are nothing to rave about and you get no recognition on board. I was platinum and because I booked VA code shares basically had the pick out of the remaining seats at check in as you cannot pre select seats. Below average experience. Next time I would fly direct and get the QF points instead. VA code shares in Singapore are cough and I will not be doing it again.Go full fare economy with Singapore Air, and you get 60 SC per legSo 240 return trip
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edit: I think NZ uses the 767/older seats. Comfortable but I would be miffed they aren't flatbeds/newer seats.