First, travel in personal airplanes provides almost the ultimate in freedom. You can go where you want, when you want, rapidly and with ease. This concept is scary to the government. So, because technology allows it, they monitor these private movements. It would not be possible to monitor personal movements in the family car in the same way. But most important, we wouldn't stand for it. How many interceptions — by cops with guns — of families on vacation based on their travel patterns would it take before there was national outrage?