Travelers have waited for this

Veteran travelers know the drill: Arrive hours early at the airport, scramble to the security checkpoint, mutter prayers that the line doesn’t snake down the terminal concourse and disappear into the ether. Of all the lines that Americans endure — at theaters, restaurants, ballparks — the airport security checkpoint line stirs the greatest dread. Because miscalculating can mean missing a flight, setting in motion a domino effect of travel disaster.