The category "<air_location>" can be expressed as follows:
<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>
<bearing_range> <altitude> <heading_aspect> <air_speed>