A man who identified himself as Dan told KIIS-FM's morning hosts, Kyle and Jackie O, he obtained permission before landing his aircraft.
"Every now and then we do that sort of stuff," the man said. "Kyle if you ever need a cheeseburger give us your coordinates of where you live and we'll drop in with it."
The radio show offered $1,000 to the pilot if he called into the show. Dan asked for the reward money to be donated to the Ronald McDonald House charity.
The Civil Aviation Safety Authority said the landing would be considered legal if the pilot got permission from the landowner before touching down. Spokesman Peter Gibson said the investigation into the incident is ongoing.
"Was it unusual? Yes. Was it unsafe? We're not in a position to say until we've looked at the footage," Gibson told the New Zealand Herald.
McDonald's Australia spokeswoman Skye Oxenham seemed to indicate the chain consented to the landing.
"We welcome all customers into our restaurants, as long as they arrive and depart safely," she told 9News.