Technology: On a Cushion of Air

Graceful as they are in the air, today's jetliners have become increasingly awkward on the ground. Taxiing under their own power, they use inordinate amounts of fuel; maneuvering them in maintenance areas and hangars is tough and timeconsuming. And such troubles will only grow worse with the introduction of the 490-passenger Boeing 747 and the supersonic transport. One way to solve the problem, say engineers of Seattle's Aero-Go Inc., is to keep the planes aloft even when they are on the ground. They have done just that by developing a device that...