Is AS allowing Y pax to move to the Preferred seats (behind Premium, available to elites at booking) at boarding? Asking because I'm flying SFO-JFK on a 319 tomorrow. Due to cancellation of earlier flight this one is relatively full in coach, both regular and Premium. But the Preferred block only has 2 pax, including me, so there's a great buffer. I'm curious whether those seats will get filled as pax redistribute themselves?