B64BLevel 3
LIGHTER-THAN AIR AIRCRAFT
**Definition:** This place covers:
**Glossary:** - Balloon: Rigid or non-rigid free-flying (no directional control) lighter than air aircraft - Blimp: Non-rigid flight controlled lighter than air aircraft - Zeppelin: Rigid flight controlled lighter than air aircraft - Hybrid airship: Aircraft where lift is produced by both lighter than air compartments and aerodynamic surfaces (wings)
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