Originally Posted by
Tableview
Some cargo ships are allowed to take up to 12 passengers in what they call 'owners' cabins. Above that number the licensing requirements become more onerous, for example they need to carry a qualified doctor.
No idea about cargo airlines I'm afraid but this is how my Great Aunt and Uncle went around the world many years ago... Both qualified doctors, they apparantly had huge fun on various ships going round the world.
This not long after WWII and said GA had spent many years working in the slums of Glasgow, mainly fighting TB, so she seriously earned the R&R time onboard!