The rules that use the category "<flight_noun-sing>" are:

<unit_n>

<flight_noun-sing> <base_of_fire_phrase>

<point_type>

<flight_noun-sing> <point_type-not_ranked>

<flight_noun-sing> <point_type-not_ranked-sing>

<point_type-checkpoint-sing>

<flight_noun-sing> <point_type-not_ranked-checkpoint-sing>

<point_type-pl>

<flight_noun-sing> <point_type-not_ranked-pl>

<point_type-debark_point-sing>

<flight_noun-sing> <point_type-not_ranked-debark_point-sing>

<flight_id-creatable-sing>

<flight_noun-sing> of <digit-pl> <specific_aircraft_type-pl>

<flight_noun-sing> of <specific_aircraft_type-pl>

<bare_flight_id>

<flight_noun-sing> <id_num-sing>

<point_type-sing>

<flight_noun-sing> <point_type-not_ranked-sing>

<point_type-landing_zone-sing>

<flight_noun-sing> <point_type-not_ranked-landing_zone-sing>

<unit_n-sing>

<flight_noun-sing> <base_of_fire_phrase>

<flight_type-not_creatable-sing>

<flight_noun-sing>

<specific_aircraft_type-not_creatable-sing> <flight_noun-sing>

<point_type-base_of_fire-sing>

<flight_noun-sing> <point_type-not_ranked-base_of_fire-sing>

<point_type-embark_point-sing>

<flight_noun-sing> <point_type-not_ranked-embark_point-sing>

<unit_n-not_det-sing>

<flight_noun-sing> <base_of_fire_phrase>

<point_type-craft_landing_zone-sing>

<flight_noun-sing> <point_type-not_ranked-craft_landing_zone-sing>

<flight_id-not_creatable-sing>

<flight_noun-sing> of <digit-pl> <specific_aircraft_type-pl>

<flight_noun-sing> of <specific_aircraft_type-pl>

<point_type-point_id_type_none-sing>

<flight_noun-sing> <point_type-not_ranked-point_id_type_none-sing>

<point_type-objective-sing>

<flight_noun-sing> <point_type-not_ranked-objective-sing>

<flight_type-creatable-sing>

<specific_aircraft_type-creatable-sing> <flight_noun-sing>

<flight_type-sing>

<flight_noun-sing>

<specific_aircraft_type-sing> <flight_noun-sing>