Pennies from Heaven.
Fareastdriver,
(Your #6033) Reminds me, that when "Challenger" exploded in '86, there was a huge cloud of ice crystals at some 50,000 ft which persisted for several minutes.
As for the "Concorde" whimsy, I seem to remember that, a long time ago, there was an airliner coming in to LHR (?) It had been high, the structure was very cold. The effluent from galley and toilets had frozen to the bottom of the fuselage - until it came to the warm air below !
Then an unpleasant "ice lolly", weighing about a half-cwt, became detached, went through a roof somewhere in W.London, and (I think) came to rest on a bad (luckily unoccupied). A veil must be drawn over the rest of the story !
Danny.