The thing is helicopters are different from airplanes An airplane by it’s nature wants to fly, and if not interfered with too strongly by unusual events or incompetent piloting, it will fly.
– Harry Reasoner
Most people are flying to Heathrow because it’s a hub, so they can fly on to other places, often long-distance flights. If they can’t go on those long-distance flights from Heathrow, they will go to Paris, they will go to Amsterdam, they will go to Frankfurt, because those are viable alternatives.
– Geoff Hoon
The same thing is to be understood of all bodies, revolved in any orbits. They all endeavour to recede from the centres of their orbits, and were it not for the opposition of a contrary force which restrains them to and detains them in their orbits, which I therefore call Centripetal, would fly off in right lines with a uniform motion.
– Isaac Newton