I'm looking at method to sort that out for Colorado. The FAA is first
sorting is out for aircraft
http://www.avweb.com/eletter/archive...ll.html#191179

One of our club members recently found himself as registered owner of a
glider he sold nine years ago.

Clearly, some percentage of active soaring pilots are not SSA members.
Likewise, some number of SSA members are not active soaring pilots. If
they take too many pilots out of the database, they'd have less
justification for their existence.

Frank Whiteley