A commuter bus express service operated under advanced arrangements and according to prearranged conditions (e.g., hours, days, specific routing) for a guaranteed number of patrons from a given area on a prepaid, reserved seat basis. The service may be paid for by an individual, group of individuals, or company. Service is guaranteed, usually arranged for an extended period of time and is paid for regardless of whether anyone rides the service. Subscription service differs from contract service in that under subscription service, the individuals, routes, and destinations never change for the duration of the subscription. Revenue collected from subscription service is counted as farebox revenue. Subscription service is open to the public.