Going through security at U.S. airports is a continuing nuisance. One technology improvement that I saw at Brussels Airport is simple: the conveyor on which you place your computer, bag, etc., slopes downward toward the x-ray machine, so that there is no need to drag bins and bags along the conveyor. Moreover, there is an adjacent conveyor that tilts backward toward the rear of the belt on which the staff can place a pile of used bins.
These devices save passenger time and are labor-saving for the security company too — no need for the workers to drag the bins by hand or hand-truck to the rear of the belt. Are we slow to innovate (how un-American that would be!) or does cheap semi-skilled labor reduce the incentive to substitute capital for labor?