Yes Bruce W you are correct on that point. I transited thru Dallas in 2016 but they never had it at that point & neither did Seattle or Chicago in 2017. JFK first time I experienced it was in August of 2017 & they did advise it was on "trial basis" for country wide implementation & only at T4. I have friends who have been thru other terminals recently & they still have the long lines. Either way good move.