I don't get it. There is no "crew pass" line, unless I'm living in a different world. In some airports you have special "crew/employee" lines, but nobody has CASS up at security, CASS is only available at the ticket agent computers.
This whole rumor makes no sense. The only thing I can think of is maybe the TSA wants new security at FBOs (you know the TSA is drooling) or as a previous poster mentioned, Washington National security stuff.
But the whole bit of "In uniform with a ticket the airport doesn't know how to deal with us" sounds like utter BS. Show them your ticket, show them your driver's license and Bob's your uncle. The minimum-wage temps working the lines checking IDs (prior to the TSA) don't care if you're wearing a thong and vinyl gloves. As we all know, the TSA doesn't care either.
Now, if perhaps, just maybe...you're trying to beat the lines and just maybe try to use the employee-only line, I could, just perhaps (maybe?) see a fractional guy get sent right back to regular security.
Maybe you guys are trying to get through with the "flight crew members in uniform" not subject to shoes/liquids, and they're not having any of it without airline IDs. I could believe that.
Again, CASS is not even in place at security. There isn't even a way to check someone against CASS unless you're at the check in ticket counter, or the gate counter.
Here ya go...
http://findarticles.com/p/articles/mi_m0CWU/is_2008_July_18/ai_n27928166