Don’t know how much help this will be to you but I would expect that your Pan Am trip would have been on a Boeing 707-320 series although far less likely it may also have been a DC8. It was too early for the 747 and too late for the piston engine types.

Likewise the BOAC trip was more than likely either the 707-420 Rolls Royce Conway powered! A 707-320 type similar to Pan Am or even if you were very lucky, a Vickers VC10. By that time it could have been one of BOACs early 747-100s. Maybe others here can help:)

Thanks for this. It’s a lot more than I was expecting given the sparse details I supplied. You’re a gent.