Further to lightning strikes, checkout the link to the Atmospheric Science hall display at the University of Albany, NY. Note the 3 cm hole in the wing tip made by the lightning bolt.
www.deas.albany.edu/deas/bvonn/707wingt.html
Sister ship N710PA photo taken at New York Int'l (pre JFK) early 1960s:
http://members.tripod.com/~psa188/photos/ia9547.JPG