Just came through LAS today. Security lines were ridiculously long for a Sunday mid-morning. Wait time was shortest for D terminal (NW, Delta, AA) which I cleared in roughly 50-60 minutes mainly because of good tactical choices-the lines are NOT marked, so it's basically a free for all from the minute you get your boarding pass until you can hit the checkpoint, appeared to be longest lines for A&B. They were lined up all the way across the top floor wrapped round and round and DOWN the escalator, across the lower level and to the ticket counters. Have no idea how people were expecting to make their flight.