Bomb scare frequency

Date:         03 Aug 97 02:50:14 
From:         Mark Taylor <marktaylor@worldnet.att.net.REMOVE.THIS>
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For the second time in less than 24 hours, there has been a bomb scare
aboard an airliner here in the Dallas area.  Yesterday's was on a
DAL-Houston Southwest 737 and that aircraft was delayed four hours.  On
taxi from the gate for takeoff, a passenger noticed a note in the
seatback pocket saying that there was a bomb in the cargo bin.  Nothing
was found.

Today, a Delta MD-90 arriving from PHX suffered a bomb scare when a
passenger found a five page written note in the inflight magazine.  It
landed safely and only a few passengers were injured during the
subsequent evacuation.  Nothing was found on this aircraft either.

These two incidents made me wonder just how often these type of events
happen around the world.  I don't hear of them too often but that
doesn't mean that they didn't happen.  Can anybody shed any light on
this subject?