June 1960, Heathrow to Idlewild (as it then was) in a KLM SuperConstellation via Shannon and Gander. We were all weighed as we checked in. Return in September was non-stop in a DC7C, also KLM.
This was a student charter. In those distant days we were surprised to find that beer was available on board, and even more surprised to find that it was free!
Someone had brought a guitar along, and most of the 70 or so of us congegrated in the aft cabin for a singsong. After a while we got a request from the captain for some of us to move forward as we were making the plane tail-heavy.
The cost was £70 each, including a Greyhound from New York to Toronto.