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18 seats 20 percent reduction 25 seats a c d g acceleration and deceleration aircraft assumed available seat mile average stage length basic purchase price Bell Bell block speed cents cost per available cost per revenue cost sensitivity cruise distance cruising speed Vc Department of Housing DIRECT OPERATING COSTS dollars/avg dollars/hr Equation Federal Aviation Agency four vehicles HELICOPTER IN URBAN HELICOPTER OPERATIONS hourly operating costs Housing and Urban intraurban larger passenger markets load factor machine maximum cruising speed mile cost monograph NUMBER one-third mile operational fluidity Piston engine present-day helicopters PRICE VERSUS THEORETICAL PURCHASE PRICE VERSUS reduce available revenue seat S-58 operating seat mile CaSM seat mile cost seating capacity shows the estimated Sikorsky Sikorsky Sikorsky Single rotor SPEED-TIME HISTORY stage length distance taxicabs technological Theoretical Productivity TRIP COSTS trip lengths turbine engine unloading and loading Urban Development URBAN MASS TRANSPORTATION urban transportation Vertol VTOL type