My favourite aviation joke..
'London, 'Merican 99'
'American Niner Niner, London, descend to altitude six tousand feet, QNH Wun Zero Zero Tree'
'Merican 99, can we have that in inches?'
Certainly, American Niner Niner, descend to altitude seven two tousand inches, QNH Wun Zero Zero Tree'
Hat, coat.
TOO