The public healthcare system also provides free (at the point of service) ambulance services for emergencies, when patients need the specialist transport only available from ambulance crews or when patients are not fit to travel home by public transport. These services are generally supplemented when necessary by the voluntary ambulance services (British Red Cross, St Andrews Ambulance Association and St John Ambulance). In addition, patient transport services by air are provided by the Scottish Ambulance Service in Scotland and elsewhere by county or regional air ambulance trusts (sometimes operated jointly with local police helicopter services) throughout England and Wales.