Please see the most recent updates in the "Where did the .com name go?" thread. Posts number 16 and 17.
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SOH ADMINISTRATIONView attachment 3838
Mine would have to be the Lockheed L-188 Electra. This is the plane that introduced the turboprop to the civilian market. It had a shaky start in life with some structural problems, but once they were worked out, the aircraft became a success.