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

Narrower term/s

• barrage balloons
• meteorological balloons
• sounding balloons
• hot-air balloons
• captive balloons [NP]
• free balloons [NP]

Anotations

Scope note:

Refers to nonporous, flexible spherical or pear-shaped bags or envelope made of a lightweight material inflated with heated air or a gas that is lighter than air and designed to rise and float in the atmosphere, usually while carrying aloft passengers or scientific instruments.