Originally Posted by FWAAA
Not an airline policy; federal rule.
Enacted by the FAA on about October 8, 2001 and announced by Norm Mineta upon the reopening of DCA.
Airlines enforce lots of federal rules demanded by the FAA and TSA. That doesn't make them "airline policy."
TSA does not enforce this policy. The airlines do.
Is that better? Does that clear up the confusion?