Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Furnishings and Equipment (hierarchy name)
4. Transportation Vehicles (hierarchy name)
5. vehicles (transportation)
6. air and space transportation vehicles
7. aircraft
8. [aircraft by form]
9. lighter than air aircraft
10. balloons (aircraft)

Anotations

Scope note:

Unpowered round or pear-shaped airtight vessels designed to rise into the air when inflated with hot air or a gas, and which are tethered to the ground or another vehicle such as a ship. These may be manned or unmanned, and most usually used for observation, historically in a military context.