This is the Premier Access Security screening line at ORD Chicago O'Hare International airport. Note all the passenger types that are allowed in this supposedly premium airline passenger TSA checkpoint: Global Services, Presidential Platinum, First, Business, OnePass Elite, Mileage Plus Premier, Star alliance Gold/Silver. In addition, many United MileagePlus Chase credit card holders also gain access just by opening an account.
If all these people can use the premium line, just how exclusive is it really? And might that be the simple reason that this line is actually longer than the general admission security line?