"With 50 percent of US exports, by value, traveling by air, [airport investment] is critical to companies and economic growth everywhere, but very few people know that," he said. "Unlike roads and bridges that people drive over and get stuck in traffic every day, airports seem to work pretty smoothly. There are no potholes and, with a few exceptions, you are not waiting at the back of a long line of planes. And you don't use it every day. So it is sometimes out of mind, but when you need it, and want it, you want to have it work."