The plane: The Travel Editor (one of the Herald's resident plane nerds) informs me it was an A320.
Class: We're all Economy on these little domestic hauls.
My seat: 15E.
The price: One-way fares start from $83.
Flight time: We were a little delayed in take off due to a no-show passenger whose bag had been checked in and loaded on to the plane. This led to a game of "the passenger or the bag", where the mystery flyer was in a race against airline staff to arrive before they located his bag. He didn't turn up in time, they found his bag and neither made it to Queenstown.