Imagine...….(An 'oldie', but.....)
The 'early' days of 4 engine aircraft across the Atlantic, on a RPT basis, passenger gets an invite to flight deck, (like they used to then...), and after talking to pilot for a short time, asks....
"Capt., what do you think would the minimum number of engines for a risk free 'comfortable' flight across this vast ocean?"
Capt thinks for a while, then responds, "When the FO says to me, 'Capt, we have a problem - Number 16 is losing oil pressure...'
And I reply, "Oh!.. Which side..??"
As told to me troooly…….
Cheers