A ramp services control system (1) for use in an airport, the system comprising: a central control station (2) which is configured for wireless communication; and a plurality of mobile devices (4) which are each configured to be carried by a respective operator and configured to communicate wirelessly with the central control station (2), each mobile device (4) comprising: a communication unit (5) which is configured to receive a ramp services instruction wirelessly from the central control station (2); a screen (8) which is configured to output the ramp services instruction visually to an operator; and an input device which is configured to receive an input from the operator in response to the received ramp services instruction, the communication unit (5) being configured to transmit data indicative of the input from the operator to the central control station (2), such that the central control station (2) can monitor ramp services instructions sent to the mobile devices (4) and responses transmitted from the mobile devices (4) in response to the ramp services instructions to control ramp service operations in an airport.