Bristol Britannia
An interesting fact about the Britannia.
El Al were about to introduce an Israel - New York service which was to route Tel Aviv - London - New York and vv. On the last proving flight they had on board an ex RAF navigator who was Technical Adviser to the El Al Chairman.
After take off to return to London from New York he managed to get them into the core of the jetstream and stay there right the way across the Atlantic & Europe before landing at Tel Aviv non stop from New York, at all times all fuel requirements for diversions etc were maintained.
This flight was just before Christmas 1956, the navigator John ED Williams later went on to found Euravia which later became Britannia Airways.