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

<flight_type-not_creatable>

<flight_noun>

<specific_aircraft_type-not_creatable-sing> <flight_noun>

<bare_flight_id>

<ordinal> <flight_noun>

<flight_id-not_creatable>

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

<flight_noun> of <specific_aircraft_type-pl>