True, but to provide reliable commuting you pretty much have to fly IFR, especially in a place like SF Bay or LA. This is because often marine layer clouds don'

True, but to provide reliable commuting you pretty much have to fly IFR, especially in a place like SF Bay or LA. This is because often marine layer clouds don't clear until 10am and people want to be at work long before then. It may be possible to do a lot more to improve the availability of IFR approaches and routes if we factor in automated systems. It's going to take a lot longer to build more airports, but I can tell you that pretty much every airport manager in the United States will be thrilled to face that problem.