Summer months mean more airline passengers which, in turn, means longer security lines.
The TSA and airport officials across the country are recommending travelers give themselves a minimum of 2 hours to get through security checkpoints at US airports this summer. A combination of fewer TSA staff members (due to budgetary constraints), new screening procedures (which regularly evolve & change) and more passengers will very likely lead to greater wait times to traverse security checkpoints. Please plan accordingly!