80,921,527 passengers in 2016

LAX made our list as one of the worst TSA checkpoints in the U.S.  Comments on Reddit.com call it “the worst.” “Designed in the '20s and '30s, completed in the '40s, LAX is drastically undersized for the number of travelers who pass through its infernal gates every day. The ‘horseshoe’ can't handle the traffic, but that's after you've fought your way to the West side just to get there.”