Phoenix is planning on extending the highly successful light rail system to its downtown airport--at a cost of 1.1 Billion $. Its just a few miles, too. As I mentioned, its a downtown airport. $1.1 bil would probably pay for one of those semi-fast 110 mph diesel electric lines to Tucson 100 miles away. I'd rather have the train to the Old Pueblo, myself. For a few million bucks, they could have a nice station along their new light rail line with robust shuttle service to the airport. That works very well if people trust the service. Just my 2cents worth.