We are having a big problem here in St. Louis with people being so paranoid that they are showing up 8 and 9 hours before their flights. This was causing the folks who came 2-3 hours early to be so far back in the lines that they missed their flights altogether.
What they have asked here is that you not show up between 2 and 3 hours early, but not more than 3 hours before your flight, or at least that you not get into the checkin line before then.