Much of that money pays for under-used rural services to cart fresh air from village to village, while commuter trains into London and other big cities are jammed to the LIDS.

They knew that better metropolitan transportation coordination, land use, and air quality could be achieved by integrating commuter railways with the dominant bus system.

Like any other flight, the small commuter airliner will respond to instructions from air-traffic controllers, navigate a path and take care to avoid other aircraft.