The TSA staff shortage is dragging on at U.S. airports. Some experts say privatization is the solution

Long security lines snaked into baggage claim areas and parking garages at some U.S. airports this weekend, a possible indicator of more widespread travel problems as the latest government shutdown drags on.

That kind of disruption, while not yet widespread, is not a concern that typically surfaces at San Francisco International Airport, the largest of nearly two dozen U.S. airports where screening checkpoints are staffed by private contractors under a little-used federal program that allows...