As a child, LUX-KEF-JFK on Loftleidir, in 1967. I rembered our airplane must have been a B707, but then I looked it up, it must have been a Canadair CL-44 turboprop aircraft
Later, as an adult, BRU-DKR-ASU-SCL on the now defunct LAP - Líneas Aéreas Paraguayas, in 1989, mostly on a B707. Water was leaking from the ceiling while the airplane was descending before landing). The Berlin wall came down while we were in South America.