[graph1_on_flight
     [any flight (^$(no inheritance)$^),
          from_place: a spatial_object,
          to_place: a spatial_object,
          day_of_the_week: a day_of_the_week,
          via_place: a spatial_object,
          departure_time: a time_measure,
          arrival_time: a time_measure,
          may have for relation_from_situation (^$(explore)$^): a thing,
          agent: an airplane_pilot,
          may have for experiencer: several passenger]
];