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

<contact_command-recursive>

<contact_directive> <contact_type-point_id_type_none> <air_location>

<contact_directive-commit> <contact_directive-flight_advisory-not_commit> <contact_type-point_id_type_none> <air_location>

<contact_directive-flight_advisory> <contact_type-point_id_type_none> <contact_type-point_id_type_none> <air_location>

<contact_directive-flight_advisory> <contact_type-point_id_type_none> <contact_type-point_id_type_none> <contact_rel> <air_location>

<contact_directive-not_flight_advisory> <air_location>

<contact_type> <air_location>

<contact_type> <contact_rel> <air_location>

<contact_type_nom-point_id_type_none> <air_location> <contact_type-point_id_type_none>

<vector>

<vector_prefix> <air_location>

<vector-has_destination-recursive>

<vector_prefix> <air_location>

<contact_command-point_id_type_none-recursive>

<contact_directive> <contact_type-point_id_type_none> <air_location>

<contact_directive-commit> <contact_directive-flight_advisory-not_commit> <contact_type-point_id_type_none> <air_location>

<contact_directive-flight_advisory> <contact_type-point_id_type_none> <contact_type-point_id_type_none> <air_location>

<contact_directive-flight_advisory> <contact_type-point_id_type_none> <contact_type-point_id_type_none> <contact_rel> <air_location>

<contact_directive-not_flight_advisory> <air_location>

<contact_type-point_id_type_none> <air_location>

<contact_type-point_id_type_none> <contact_rel> <air_location>

<contact_type_nom-point_id_type_none> <air_location> <contact_type-point_id_type_none>

<contact_command-point_id_type_none>

<contact_directive> <contact_type-point_id_type_none> <air_location>

<contact_directive-commit> <contact_directive-flight_advisory-not_commit> <contact_type-point_id_type_none> <air_location>

<contact_directive-flight_advisory> <contact_type-point_id_type_none> <contact_type-point_id_type_none> <air_location>

<contact_directive-flight_advisory> <contact_type-point_id_type_none> <contact_type-point_id_type_none> <contact_rel> <air_location>

<contact_directive-not_flight_advisory> <air_location>

<contact_type-point_id_type_none> <air_location>

<contact_type-point_id_type_none> <contact_rel> <air_location>

<contact_type_nom-point_id_type_none> <air_location> <contact_type-point_id_type_none>

<contact_command>

<contact_directive> <contact_type-point_id_type_none> <air_location>

<contact_directive-commit> <contact_directive-flight_advisory-not_commit> <contact_type-point_id_type_none> <air_location>

<contact_directive-flight_advisory> <contact_type-point_id_type_none> <contact_type-point_id_type_none> <air_location>

<contact_directive-flight_advisory> <contact_type-point_id_type_none> <contact_type-point_id_type_none> <contact_rel> <air_location>

<contact_directive-not_flight_advisory> <air_location>

<contact_type> <air_location>

<contact_type> <contact_rel> <air_location>

<contact_type_nom-point_id_type_none> <air_location> <contact_type-point_id_type_none>