obst - opti
- obstacle
- obstacle assessment surface
- obstacle clearance
- obstacle-clearance altitude (OCA)/obstacle-clearance height
- obstacle-clearance box
- obstacle-clearance limit
- obstacle-clearance speed
- obstacle-free zone
- obstacle-limitation surfaces
- obstruction
- obstruction angle
- obstruction beacon
- obstruction light
- obstruction marker
- obstruction-clearance speed
- occluded front
- occult light
- occulting
- oceanic airspace
- oceanic clearance
- oceanic published route
- octa
- octane rating/number
- octant
- oculogravic illusion
- off course
- off-airways
- off-idle mixture
- off-mounted
- off-route obstruction-clearance altitude
- off-route vector
- offensive air
- offensive air support
- offensive counter–air operation
- offensive electronics
- offset bombing
- offset hinge
- offset parallel runways
- oil cooler
- oil dilution
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