CIVIL AERONAUTICS BOARD Domestic common carrier intercity passenger travel market scheduled and nonscheduled services of airlines, buses, railroads, and waterways, 1951-63 [Millions of passenger-miles] 1 ICC data 1957-62. National Association of Motor Bus Operators (NAMBO) data 1951-56. To make the data for 1951-56 comparable with data for 1957-62, NAMBO estimated the former years by applying a certain percentage to existing ICC data for those years. 2 Electric railway figures are estimated by ICC. NOTE.-Airlines: Domestic operations of certificated route and supplemental air carriers. Helicopter, intra-Alaska, and intra-Hawaii carriers are excluded. Buses: Regular-route, charter, and special-service travel in revenue service on both interstate and intrastate schedules; schoolbus travel not included. Commutation traffic is excluded. Railroads: All classes, including electric railways. Commutation traffic is excluded. Waterways: Inland and coastal waterways. Source: Form 41 and other reports to the CAB; Interstate Commerce Commission; and National Associa tion of Motor Bus Operators. |