Per Wiki, as an EXP, I can use FS c/i if I'm flying to Europe. My main interest is to by-pass the TSA
PRE-CHECK lines (at JFK, these can be long...many TSA agents scrutinize your travel documents with a "fine tooth comb"
); in order to use this feature one needs "the" pushy agent
--I've seen her in action. If several people need her services, they all can't get served. How would this then play out?
Updated to add PRE-CHECK.