I know they are "exempt" from the rule - but that's bad terminology
really,
they are simply compliant with the rule by not having transponders - not
really "exempt" from the rule in the pure form of the regulatory meaning -
I
thought Ian was alluding to some other exemption the SSA had (besides the
data plate exemption).

ahhh.. true in that regard Jim... many people read the "except as noted in
para".. and an "exemption" instead of an "exception".. and I fell into his
trap.. thanx BT