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    • Obstacle
    • Obstacle Departure Procedure (ODP)
    • Obstacle departure procedures (ODP)
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    • Obstruction lights
    • Occluded front
    • Oceanic Airspace
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    • OEI
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    • OM
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    • Operator - Unmanned Aircraft System (UAS)
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    • OPSPECS
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    • Organized Track System (OTS)
    • Orientation
    • Otolith organ
    • OUT
    • Out Of Service/Unserviceable (U/S)
    • Outer Area
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    • Outer Fix Arc
    • Outer Fix Time (OFT)
    • Outer Marker (OM)
    • Outside air temperature (OAT)
    • OVER
    • Over-the-top
    • Overcontrolling
    • Overhead Maneuver
    • Overlying Center
    • Overpower
    • Overseas air commerce
    • Overseas air transportation
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