This is one of the reasons I love the Midwest and living in smaller cities. My airport is international and flies just about anywhere you want to go, but 90% of the time I walk up to an empty line and I'm told "we don't have a precheck lane open, just walk on through". As a consultant, I fly the busiest times (monday and thursday), but the only trouble I've ever had was in Denver where I waited almost an hour and a half in a security line before I got my precheck approval.