Update! From Judy R's post earlier today. It seems that this rule is
changing faster than we can talk about it.

"-- Introductory flights, field checks, aircraft checkouts
and other proficiency flights are NOT considered flight
training."

This seems to say that it is OK for a CFIG to turn a glider ride into
an introductory lesson without dealing with the citizenship issue. A good
thing, because we pick up lots of new students that way.

Vaughn