A little late to this, but just for fun... The B-17 didn't exactly fly from London to New York; the vast majority of the traffic was the other way, from the USA to the European Theatre. I don't believe the plane was capable of flying directly across the Atlantic Ocean. What they did fly was a route beginning at perhaps Bangor or Presque Isle in Maine up into Canada (Gander or Goose Bay), further north to Greenland (Bluie West One or Bluie West Eight), east to Reykjavic, Iceland, and then onto the British Isles at Prestwick perhaps. see: http://en.wikipedia.org/wiki/North_Atlantic_air_ferry_route_in_World_War_II From there the would disperse to the many many Eighth Air Force fields in England. There was also a Mid Atlantic route through the Azores and a South Atlantic route down through the Caribbean Sea, Natal in Brazil, Ascencion Island, and on to North Africa and points west (all the way to the China Burma India Theatre !) Navigation in the early days was rudimentary to say the least, involving ded reckoning etc. but given the vast distances, bad weather, and high winds involved better resources were fairly quickly put into place. NDB and Radio Range facilites were put in in Canada, Greenland, etc. The on board navigators also used bubble sextants (a powered sextant that would generate its own horizon reference) to take star sights and establish position. Lots of people and planes lost in the frigid north due to weather, aircraft failures, bad navigation. I did the route over three nights in the FlyJSim 727, it would probably take a week in the DC-3 or B17 but this is how they did it. They even ferried fighters over to the European Theatre this way. Lots of stuff on the internets about all this, amazing stories... Terry