@classmethod
def query_active_route_ids(cls, session):
    """
        return an array of route_id / agency_id pairs
        {route_id:'2112', agency_id:'C-TRAN'}
        """
    ret_val = []
    routes = cls.query_active_routes(session)
    for r in routes:
        ret_val.append({'route_id': r.route_id, 'agency_id': r.agency_id})
    return ret_val
