"Dated a former Air Hostess, the story that got me was when an old woman died on the plane, just fell asleep on the long-haul overnight flight back from JFK to Manchester and never woke up.
Essentially they wrapped her in spare blankets and secured extra seat belts around her to keep her in place... Nobody further down the plane knew a thing until they got asked to wait in their seats while an ambulance crew took the body off before they could disembark.
TL:DR - Passengers might *not* know someone died on the flight and is still in their seat!"