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Administration air taxi airline airport American Society AMTRAK analysis areas aviation Canadian changes Civil Aeronautics Board Commission common common carrier competition concentration conglomerates containerization costs demand Department of Transportation Eastern Air Lines economic effects efficient equipment facilities factors federal firms freight growth highway increase intercity interest intermodal Interstate Commerce Interstate Commerce Act Interstate Commerce Commission investment logistics ment miles modal modes of transportation motor carrier National Transportation nomic operations ownership passenger Penn Central Transportation Pennsylvania State University percent physical distribution management planning port portation problems production Professor profit rail railroad Railway regulation regulatory result revenues riers safety ship shippers small shipments Society of Traffic structure tion tive tonnage Traffic and Transportation Traffic Manager trans transit transport policy TRANSPORTATION JOURNAL transportation system truck University urban variables warehouse