dual - easy
- dual bearing plate
- dual launcher
- dual offset runways
- dual runways
- dual system of runways
- dual twin-tandem landing gear
- dual twin-tandem wheels
- dual wheels
- dual-tandem landing gear
- dual-use shelter
- dual-wheel landing gear
- duct
- duct trench
- ducted launcher
- ductility
- dug-out
- dumb level
- dummy airfield
- dummy airplane
- dummy bomb range
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