Bristol Britannia
Whilst discussing the navigation crew skills of the Britannia lets also remember, and here someone will check the name and title of the El Al Operations flight planning man. I thought it was JED Williams who eventually went, as a founder member, to Britannia Airways at Luton.
He devised a flight plan for their 313's which allowed them to operate from Tel Aviv to JFK on a regular basis perhaps in the winter with a reduced payload. It may have been pressure pattern flying, but again someone out there may know.