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air freight aircraft airplanes airport Allegheny County American April 14 auto automobiles available seat mile average axles barge lines billion capacity cargo carry cent cities competition CONTAINERIZATION continually coordination costs Dave Parker Department of Transportation dollar efficiency electric electronic data processing equipment estimated facilities Federal future handling highway igloo important improved included increase intercity interest intermodal investment jets load factor major ment metropolitan statistical area miles per hour mobility modes Monorail motor carrier motor freight move National Nebraska Transportation Symposium non-productive Northeast Corridor Omaha operating outlays passenger percent pickup and delivery piggyback PIPELINE TRANSPORTATION pipelines planning population President problems rail railroad rates revenues river shipments shippers speed systems approach terminal tion ton-miles tons towboats traffic trailer train trans TRANSPORTATION ECONOMICS transportation system truckers trucking industry United United Air Lines urban vehicles waterways