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action agencies air carriers air transportation aircraft airline airport airways Amtrak approach areas aspects Available Seat Miles bicycle billion buses capital central business district Chap Civil Aeronautics Board competition component demand demand characteristic Department of Transportation effect elasticity environment example exists external environmental facilities factors fares Federal Aviation Administration federal government Federal Railroad Administration firms freight function funds future highway important improvements industry intercity rail intramodal involved levels major market segments mass transit ment miles noise noted oligopoly operating ownership passenger service passenger trans passenger transportation services passenger transportation system passenger-miles percent physical and economic planning population portation potential private automobile problem programs promotional public transportation publicly rail passenger railroads rates revenue safety schedule service offerings social costs social policy society streets substrategies sunk cost supply system of passenger terminal tion traffic United urban transportation utilized vehicle waterways