Quote from the article linked above: "TSA plans its staffing based on the number of travelers expected through the different checkpoints each hour."
In my experience, I have never seen evidence of any planning on the part of TSA. Countless times I have seen security checkpoint lines with hundreds, if not thousands of people slowly creeping along. Countless times I have seen idle TSA officers standing beside idle X-ray machines and scanners, while nearby a long queue of passengers wait to go through a handful of scanners. Countless times I've seen passengers miss flights due to extraordinarily long delays at security.
Flight schedules are published almost 11 months in advance, and there is loads of historical data that can be used to forecast daily, even hourly numbers of passengers. Why, then, can't the TSA do a better job?
The TSA has had years to develop and fine tune the system, but to watch it in operation today you'd think that the 9/11-related security changes were imposed just last month. It is genuinely embarrassing that the country can accomplish so many great things, but our TSA can't figure out how to screen passengers efficiently.