The reason I put a continent against a single city is that New York has been the origin or destination of fatal flights to/from Europe (TWA, Swissair, Egypt Air, Concorde) and in general is the prime US gateway for flights to/from Europe. I think there is no other single city in the world with so many connections with one other continent and there is something special about flights between New York and Europe, vv.(from Lindbergh to the only scheduled destination for the Concorde).