Terence O'Brien of Victoria University's Centre for Strategic Studies says anyone flying into New Zealand on their own jet from the United States has to be someone of reasonable seniority.
The Prime Minister has confirmed that the mysterious US government plane in Wellington last week was carrying a spy.
But John Key, who's the Minister in charge of our intelligence services, says he doesn't know who the official was nor does he know about what business he was here on.
Terence O'Brien says that's unusual.
"I would suggest that, given the obvious seniority of the visitor involved, the Prime Minister ought to have been informed and ought to know the broad reason as to why he or she is coming to this country."
International security and intelligence analyst Paul Buchanan agrees it's very unusual that the Prime Minister doesn't know exactly who was on the plane, and what business they had in New Zealand.
"If he's competent, one would assume that he would be fully briefed on the nature of the meeting, the individuals involved, and he'd possibly attend the meeting himself if he had time to do so although that wouldn't be required."
Paul Buchanan says the spy or spies were probably here to discuss a revamp of security protocols.
Photo: Getty Images