christep
There has never been a landing of a commercial jet with under wing engines on open water in a way where the safety briefing had any relevance whatsoever.
Any sensible cost benefit analysis would remove life jackets from commercial jets - the huge environmental cost of the extra fuel needed to carry millions of them around the sky each day is way out of proportion to an infinitessimally small theoretical benefit.
As I suspected and I agree. Yet lightweight smoke hoods have been continually rejected. How daft is that ?