Mosgiel resident Bruce Smaill — a crew chief at Dunedin Airport — said it was actually a Boeing 787 Dreamliner, operated by LATAN airlines, flying a repatriation flight from Sydney to Santiago, Chile, flying at 37,000 feet.
He used binoculars to get a closer look at it and could see the anti-collision light flashing.
"I found it [the plane] on Flight Radar straight away, and then there was another one about an hour later, on the exact same flight path."