Conase,

The cables and cranes used in construction are usually attached to the
earth so if static electric charges are deposited on them by passing clouds
et c. the electricity will flow to the ground. Air craft, on the other hand
are not connected to the ground during flight. Static charges built up
during flight will be discharged via the rescue cable as it nears the
ground. If you are standing on the ground and reach for a cable that has not
yet touched the ground the static electricity will discharge through you.

Dave M.