information about National Airspace System field
Field Hierarchy
| Parent | |||
|---|---|---|---|
Engineering 25M papers | Geography 13.2M papers | Aerospace engineering 2.2M papers | Cartography 1.2M papers |
Aviation 73.6k papers | Air traffic control 21.3k papers | ||
| Current | |||
National Airspace System 2,392 papers | |||
| Child | |||
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