BTIZ wrote:
It is neither FAR or Club thing.. it is the TSA.

It is a requirement for powered flight. THE TSA REQUIRES CFIs to VERIFY
NATIONALITY.

It is NOT REQUIRED for GLIDER TRAINING. The exemption letter is posted on
the SSA Web page.

Correct - see http://www.ssa.org/test/docs/gliderexemption.pdf

For "alien" airplane and helicopter students, the TSA must first
"determine that the alien does not pose a threat to aviation or national
security" - in other words, a background check.

But, I'm slightly puzzled. All instructors that I know received a letter
from the FAA/TSA about a month ago explaining these requirements. If
Slick is a US flight instructor, why didn't he get that letter?

Tony V CFIG