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advance air terminal air-cushion vehicles aircraft aircraft noise airplanes airports altitudes American Society April ASPO automatic automobile expressways benefits buses California cargo cars centers city planning commercial competitive cost cost-benefit analysis craft Curtiss-Wright effects efficiency Electric elevators engineering equipment evaluation experimental facilities feasible federal FIGURE flight Flight International forms of transportation freeway future grade separation ground transportation helicopter illus improved increased investment John Nolen land limitations lllus Melville metropolitan area miles military mobile homes monorail municipal noise Officials 1313 East over-all overhead passenger planes Planning Officials 1313 possible private enterprise railroad reduced research and development right-of-way Society of Planning sonic sonic boom space speculation concerning speed subsidy subsystems Supersonic surface take-off tank car technological tion Traffic Engineer transit TRANSPORTATION DEVELOPMENTS Transportation Systems urban scene urban transportation utility vehicle-cars vertical vertical-lift VTOL Wall Street Journal winged ground-effect York Times Section