obst - oper
- obstacle clearance plane
- obstacle lights
- obstacle zoning ratio
- obstruction
- obstruction balloon
- obstruction clearance line
- obstruction lights
- obstruction marking surface
- obstruction ratio
- occulting light
- occupational air force field
- off-airway(s) area
- off-airway(s) area
- off-base facilities
- off-base housing
- off-base recreation
- off-continent base
- off-design conditions
- off-gauge
- off-rating
- off-the-shelf
- office accommodation
- office area
- officers family housing
- officers mess building
- offset
- offset stake
- offshore launcher
- oil and fuel depot
- oil asphalt
- oil dispenser
- oil gear
- oil-surfaced airstrip
- old floe
- OMB
- omnidirectional radio beacon
- on center
- on-base logistic responsibilities
- on-board
- on-off mechanism
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