Keeping track of the traffic in the skies above us is a big job. The nation's air traffic control system has been reliable, but it's not very efficient. And efforts to replace it with newer technology have gotten bogged down by a combination of uncertain Congressional funding and the slow-moving federal bureaucracy. Now, some in Congress want to get the government out of the air traffic control business.
The Federal Aviation Administration says some 7,000 aircraft are over the U.S. at any given time.