Abstract: A ticketing method for issuing a service ticket of a transport system to a passenger comprises: checking-in the passenger via a mobile device of the passenger upon accessing a vehicle of the transport system; checking-out the passenger via the mobile device upon exiting a vehicle of the transport system; and a server computer automatically calculating a price for a travel of the passenger within the transport system by evaluating check-in data representing the checking-in of the passenger and check-out data representing the checking-out of the passenger.