A computerized reservations and scheduling system is provided which alternately allows transportation consumers to select from pre-scheduled transportation services provided by transportation providers or to negotiate and contract with transportation providers who have available unscheduled transportation space. The system comprises a central computerized data base. Transportation providers and consumers alike access the computer via a plurality of terminal units. The central computerized data base comprises a "maybe" file for storing information regarding available unscheduled transportation space which may be offered by a provider for service if a suitable consumer demand exists and for storing information regarding unscheduled transportation space which is needed by consumers. The "maybe" file facilitates negotiating and contracting between the parties.