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The problem is that the business of moving people, whether by air, rail or transit, is only marginally profitable - if at all - and as a result requires a significant public subsidy to keep its head above water. In good times, state and federal support flows pretty well to cover the needs of roads, airports, transit systems and shipping - though not intercity passenger rail. In bad times, as we have today, airlines go bankrupt and the usually flush states howl over billions in lost federal highway funds.