Some food for thought:
"...On December 8, 1962 lighting hit a Pan American Boeing 707 in a holding pattern over Elkton, Md. The lightning caused a spark that ignited fuel vapor in a tank, causing an explosion that brought the plane down, killing all 81 aboard.
"
USA TODAY ARTICLE
http://www.usatoday.com/weather/reso...irplanes_x.htm