In a message to Charles Mielke  Ray Harkness wrote:
 RH> Hi Charles,  How long does it take for a modern airliner to descend
 RH> from altitude to say 15,000 feet after a decompression ? I agree
Ray, -- (1) I don't have the answer, and (2) pardon me for jumping in, but a 
piece of related information I learned that I found interesting .... The 
Concord does not have drop down oxygen masks for the passengers.  The logic 
being that it the Concord could achieve a high enough speed during descent 
that it could reach a safe breathing altitude before anyone suffered a 
medical problem due to lack of oxygen.  --  Bob Linenweber
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