On December 21, 1988, Pan Am Flight 103, originating from Frankfurt, Germany, departed from Heathrow Airport in London, bound for New York City. Forty minutes into the flight, the plane exploded over the sky, above Lockerbie, Scotland. All 259 passengers and crew aboard were killed, as well as 11 Scots on the ground, who were struck by falling debris. The passengers and crew on Flight 103 hailed from 21 different countries and included 189 Americans, 15 of whom were active-duty military and 10 were veterans. The cairn, a traditional Scottish…