The IAF Super Connies definatly could not get to NY from Northolt. Runway length being one good reason, and the take off roll of a heavy 1049 the other.
They only came and went to the East while I was there. Usually Orly.
They were not the greatest IFR airmen hence the problems in the London FIR from time to time. (and probably other FIR's as well) Good stick and rudder guys as was witnessed when one of their C-119's lost and engine on rotate, eastbound and landed on the runway that starts at the Polish war memorial. I was sunning myself on the grass outside the crewroom when they did that one. Great bit of flying with a very unforgiving airplane when heavy and on one engine.
Speedbird 48.