ACCIDENT CASE STUDY BY MACHTELD SMITH AT 1:30 P.M., ON JANUARY 13, 2013, PIPER ARROW N4975S DEPARTED ON A ROUTINE 'COMMUTE' FLIGHT FROM SANDERSVILLE, GEORGIA, TO DELAWARE'S SUMMIT AIRPORT WHERE THE PRIVATE PILOT-A PROMINENT SURGEON-WAS SCHEDULED TO PERFORM SURGERY IN NEARBY DOVER THE FOLLOWING MORNING.