As international travel grows, so does U.S. use of technology. A look at how it's used at airports

The Belgian family of four was on their fourth trip to the United States. They had been dreading the long line at passport control when they entered the country but had heard about a new app they could use to ease their way and decided to give it a shot. Within minutes, they had bypassed the long line at Washington Dulles International Airport and were waiting for their luggage.