Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Components (hierarchy name)
4. components (objects parts)
5. [components by specific context]
6. vehicle components
7. [vehicle components by vehicle type]
8. [aircraft and spacecraft components]

Anotations

Scope note:

The complete central structures of aircraft, to which the wings, tail assemblies, and engines may be attached. In the early 20th century, the term was taken from French specifically to refer to the framework of the body of an airplane, particularly the girder-like backbone employed in airplane design; it has since come to mean the entire central structure of the aircraft.