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

<air_location>

<bearing_range> <air_speed>

<bearing_range> <air_speed> <altitude>

<bearing_range> <air_speed> <altitude> <heading_aspect>

<bearing_range> <air_speed> <heading_aspect>

<bearing_range> <altitude> <air_speed>

<bearing_range> <altitude> <air_speed> <heading_aspect>

<bearing_range> <altitude> <heading_aspect> <air_speed>

<bearing_range> <heading_aspect> <air_speed>