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OFF-ROUTE TERRAIN CLEARANCE ALTITUDE/ORTCA - An off-route altitude which provides terrain clearance with a 3,000 foot buffer from terrain. This altitude may not provide signal coverage from ground-based navigational aids, air traffic control radar, or communications coverage.
OFF-ROUTE VECTOR - A vector by Air Traffic Control which takes an aircraft off a previously assigned route. Altitude assigned by Air Traffic Control during such vectors provide require obstacle clearance.
OFFSET PARALLEL RUNWAYS - Staggered runways having centerlines which are parallel.
OFFSHORE CONTROL AREA (P/CG) - That portion of airspace between the U.S. 12-mile limit and the oceanic CTA/FIR boundary within which air traffic control is exercised. These areas are established to permit the application of domestic procedures in provision of air traffic control services. Offshore control area is generally synonymous with Federal Aviation Regulations, FAR Part 71, Subpart E, "Control Areas and Control Area Extensions."
ON COURSE -
(1)
Used to indicate that an aircraft is established on the route centerline.

(2)
Used by Air Traffic Control to advise a pilot making a radar approach that his aircraft is lined up on the final approach course. (See On-Course Indication)

ON-COURSE INDICATION - An indication on an instrument which provides the pilot a visual means of determining that the aircraft is located on the centerline of a given navigational track; or an indication on a radar scope that an aircraft is on a given track.
OPERATIONAL AIR TRAFFIC -
(1)
EUROPE AND AFRICA - Traffic that cannot comply with the provisions of General Air Traffic. Reason for non-compliance may be insufficient communications equipment or nature of the mission to be flown. In certain countries, Operational Air Traffic will be under control of Military Area Control Center or Radar while in other areas both General and Operational Air Traffic are controlled by a single civil control or advisory unit. Consult Department of Defense Flight Information Publication, AREA PLANNING (AP2), for applicability in the area concerned.

(2)
NORTHERN EUROPE (GM, U.K., BENELUX) - In the sophisticated radar environment of Northern Europe, Operational Air Traffic service is routinely provided for military aircraft by the military branch of the dual civil/military Air Traffic Control system. See Department of Defense Flight Information Publication, AREA PLANNING (AP2), Flight Plan, Europe Regional Procedures for details.

OPPOSITE DIRECTION AIRCRAFT (P/CG) - Aircraft are operating in opposite directions when:
a.
They are following the same track in reciprocal directions; or

b.
Their tracks are parallel and the aircraft are flying in reciprocal directions; or

c. Their tracks intersect at an angle of more than 135°.
OPTION APPROACH - An approach requested and conducted by a pilot which will result in either a touch-and-go, missed approach, low approach, stop-and-go or full stop landing. (See Cleared for the option)
ORGANIZED TRACK SYSTEM - A moveable system of oceanic tracks that traverses the North Atlantic between Europe and North America the physical position of which is determined twice daily taking the best advantage of the winds aloft.
OUT - The conversation is ended and no response is expected.
OUTER AREA (associated with Class C airspace) (P/CG) - Nonregulatory airspace surrounding designated Class C airspace airports wherein ATC provides radar vectoring and sequencing on a full-time basis for all IFR and participating VFR aircraft. The service provided in the outer area is called Class C service which includes: IFR/IFR-standard IFR separation; IFR/VFR-traffic advisories and conflict resolution; and VFR/VFR-traffic advisories and, as appropriate, safety alerts. The normal radius will be 20 nautical miles with some variations based on site-specific requirements. The outer area extends outward from primary Class C airspace airport and extends from the lower limits of radar/radio coverage up to the ceiling of the approach control's delegated airspace excluding the Class C charted area and other airspace as appropriate.
　
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