unlo - velo
- unloading valve
- unmanned aerial vehicle
- unmanned free balloon
- unpublished route
- unrestricted visibility
- unscheduled maintenance
- unstable air
- unstick speed
- updraft
- updraft carburetor
- uplock
- upper air
- upper atmosphere
- upper camber
- upper front
- upper-air chart
- upper-air disturbance
- upper-air observation
- uprated
- uprush
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