Yes Dick -
Is my memory correct re the Norfolk Island ditching.
Was the aircraft forced to operate at a lower level because not RVSM compliant - therefore using more fuel - therefore could not get to an alternate?
Couldn't the same thing happen re forcing non ADSB compliant aircraft to lower levels and using more fuel?
Especially if the crew have not planned for the lower level operations before departure.
How long before an accident or serious incident?