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

<flight_type-not_creatable-sing>

<flight_noun-sing>

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

<point_type-checkpoint-sing>

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

<flight_id-not_creatable-sing>

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

<flight_noun-sing> of <specific_aircraft_type-pl>

<flight_id-creatable-sing>

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

<flight_noun-sing> of <specific_aircraft_type-pl>

<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>

<point_type-sing>

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

<flight_type-sing>

<flight_noun-sing>

<specific_aircraft_type-sing> <flight_noun-sing>