ok so if i am getting this correct, the helicopter that you speak of would have needed to travel through an einstein-rosen bridge allowing it to
travel through a curved-space structure, joining two distant regions of space-time through a tunnel-like curved spatial shortcut.
not only that but the helicopter would have also (IMO) needed some sort of inertia regulator. because for the helicopter to travel at the speed needed
and then suddenly stop in a given spot the inertia would have caused the pilot/crew quite a bit of trouble to say the least.
furthermore(IMO) in order for the event to happen they would have needed some sort of way to not only make the 'worm' hole as you say, 'open up'
so to speak but also they would have needed a way to make it 'close'
so the helicopter would have basically needed to alter the gravity or lack thereof surrounding itself.

