"Although there is still work to be done it would seem that, on the basis of the success of this flight, a UAV could operate in different classes of airspace."

"It's still very early days in terms of that regulation taking place."

"It's not just the technology, we're trying to think about the social impact of this and the ethical and legal things associated with it," he said.

"You've got to solve all this lot if you're going to make it happen, enable it to happen affordably."