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O&M: Operating and Maintenance (USCG5)

O/D: Origin and Destination (OST3)

O/D: Overdrive (TII1)

O3: Ozone (BTS2)

OAG: Official Airline Guide (FAA17) (MTMC1)

OAK: Metropolitan Oakland International Airport (FAA11)

Oakie Blower: Air scoop on air intake to increase power. (ATA1)

OAL: Over-All-Length (Of the Vehicle) (TII2) (TII1)

OALT: Operational Acceptable Level of Traffic (FAA4)

OAP: Oceanic Automation Program (FAA19)

OASD: Office of the Assistant Secretary of Defense (AIA1)

OASIS: Operational and Supportability Implementation System (FAA19)

OBD: Operation Buckle Down (NHTSA6)

Object: Includes, but is not limited to above ground structures, people, equipment, vehicles, natural growth, terrain, and parked aircraft. (FAA12)

Object Class: As the term is used in expense classification, an object is an article or service obtained. An object class is a grouping of expenses on the basis of goods or services purchased. The object classes include salaries and wages, fringe benefits, services, materials and supplies, and other expenses as defined in Section 7.2, Volume II of the Uniform System of Accounts (USOA). (FTA1)

Object Free Area (OFA): A two dimensional ground area surrounding runways, taxiways, and taxilanes which is clear of objects except for Navigation Aids (NAVAIDs) and objects whose location is fixed by function. (FAA12)

Objects Not Fixed: Objects that are movable or moving but are not motor vehicles. Includes pedestrians, pedalcyclists, animals, or trains (e.g., spilled cargo in roadway). (NHTSA3)

Obligations Under Capital Leases (Current and Noncurrent): Liability applicable to property obtained under capital leases. (BTS4)

Obstacle: An existing object, object of natural growth, or terrain at a fixed geographical location or which may be expected at a fixed location within a prescribed area with reference to which vertical clearance is or must be provided during flight operation. (FAA4) (FAA8)

Obstacle Free Zone (OFZ): (See also Inner-Approach Obstacle Free Zone, Inner-Transitional Obstacle Free Zone, Runway Obstacle Free Zone) The obstacle free zone (OFZ) is a three dimensional volume of airspace which protects for the transition of aircraft to and from the runway. The Obstacle Free Zone (OFZ) clearing standard precludes taxiing and parked airplanes and object penetrations, except for frangible navigation aid (NAVAID) locations that are fixed by function. Additionally, vehicles, equipment, and personnel may be authorized by air traffic control to enter the area using the provisions of Order 7110.65, Air Traffic Control, paragraph 3-5. The runway OFZ and when applicable, the inner-approach OFZ, and the inner-transitional OFZ, comprise the OFZ. (FAA4)

Obstruction: Any object/obstacle exceeding the obstruction standards specified by Federal Aviation Regulations (FAR) Part 77, Subpart G. (FAA4) (FAA8)

Obstruction Accident: An accident/incident consisting of striking: 1) A bumping post or a foreign object on the track right-of-way; 2) A highway vehicle at a location other than a highway-rail crossing site; derailed equipment; or 3) A track motorcar or similar work equipment not equipped with Association of American Railroad couplers, and not operating under train rules. (FRA2)

Obstruction Light: A light or one of a group of lights, usually red or white, frequently mounted on a surface structure or natural terrain to warn pilots of the presence of an obstruction. (FAA8)

Obstruction to Air Navigation: An object of greater height than any of the heights or surfaces presented in Subpart C of Federal Aviation Regulations (FAR) Part 77. (FAA12)

OCC: Operations Control Center (FAA7)

Occupancy: The number of persons, including driver and passenger(s) in a vehicle. Nationwide Personal Transportation Survey (NPTS) occupancy rates are generally calculated as person miles divided by vehicle miles. (FHWA3)

Occupant: Any person who is in or upon a motor vehicle in transport. Includes the driver, passengers, and persons riding on the exterior of a motor vehicle (e.g., a skateboard rider who is set in motion by holding onto a vehicle). (NHTSA3)

Occupational Illness: Any abnormal condition or disorder of a railroad employee, other than one resulting from injury, caused by environmental factors associated with his or her railroad employment, including, but not limited to, acute or chronic illnesses or diseases which may be caused by inhalation, absorption, ingestion or direct contact. (49CFR225)

Occupational Illness: Any abnormal condition or disorder caused by environmental factors associated with a worker's employment, but not the result of an injury. (FRA3)

Occupied Caboose: A rail car being used to transport non-passenger personnel. (49CFR171)

Ocean Bill of Lading: A receipt for the cargo and a contract for transportation between a shipper and the ocean carrier. It may also be used as an instrument of ownership which can be bought, sold, or traded while the goods are in transit. (USTTA1)

Ocean Freight Differential (OFD): The amount by which the cost of the ocean freight bill for the portion of commodities required to be carried on U.S. flag vessels exceeds the cost of carrying the same amount on foreign flag vessels. When applied to agricultural commodities shipped under Food for Peace, OFD is the amount paid by the Commodity Credit Corporation. (USTTA1)

Ocean Going Container: Usually made of steel, it is a large rectangular box designed for easy lift on/off by cranes. (BOC3)

Oceanic Airspace: Airspace over the oceans of the world, considered international airspace, where oceanic separation and procedures per the International Civil Aviation Organization are applied. Responsibility for the provisions of air traffic control service in this airspace is delegated to various countries, based generally upon geographic proximity and the availability of the required resources. (FAA4)

Oceanic Display and Planning System: An automated digital display system which provides flight data processing, conflict probe, and situation display for oceanic air traffic control. (FAA4)

Oceanic Navigational Error Report (ONER): A report filed when an aircraft exiting oceanic airspace has been observed by radar to be off course. ONER reporting parameters and procedures are contained in Order 7110.82, Monitoring of Navigational Performance In Oceanic Areas. (FAA4)

Oceanic Published Route: A route established in international airspace and charted or described in flight information publications, such as Route Charts, Department of Defense (DOD) En Route Charts, Chart Supplements, NOTAM's, and Track Messages. (FAA4)

Oceanic Transition Route: Route established for the purpose of transitioning aircraft to/from an organized track system. (FAA4)

OCMI: Officer In Charge, Marine Inspection (USCG1)

OCP: Overland Common Point (MARAD2)

OD: Outside Diameter (TII1)

ODALS: Omnidirectional Approach Lighting System (FAA4) (FAA17) (FAA19)

ODAPS: Oceanic Display and Planning System (FAA4) (FAA19)

ODL: Oceanic Data Link (FAA7)

ODMS: Operational Data Management System (FAA19)

ODS: Operating-Differential Subsidy (MARAD4)

ODSA: Operating-Differential Subsidy Agreement (MARAD4)

OECD: Organisation for Economic Cooperation and Development (BTS2)

OEI: One Engine Inoperative (14CFR1)

OFA: Object Free Area (FAA12)

OFD: Ocean Freight Differential (MARAD4) (USTTA1)

Off Course: (See also On Course, On-Course Indication) A term used to describe a situation where an aircraft has reported a position fix or is observed on radar at a point not on the air traffic control (ATC) approved route of flight. (FAA4)

Off Route Vector: A vector by Air Traffic Control (ATC) which takes an aircraft off a previously assigned route. Altitudes assigned by ATC during such vectors provide required obstacle clearance. (FAA4)

Off-Road Vehicular Area: An area for the testing of, or use by, vehicles that are designed to travel across the terrain. (DOI4)

Office of the Secretary of Transportation (OST): The Department of Transportation is administered by the Secretary of Transportation, who is the principal adviser to the President in all matters relating to Federal transportation programs. The Secretary is assisted in the administration of the Department by a Deputy Secretary of Transportation, a Associate Deputy Secretary, the Assistant Secretaries, a General Counsel, the Inspector General, and several Directors and Chairmen. (OFR1)

Officer In Charge Marine Inspection (OCMI): A person from the civilian or military branch of the Coast Guard designated as such by the Commandant and who under the supervision and direction of the Coast Guard District Commander is in charge of a designated inspection zone for the performance of duties with respect to the enforcement and administration of Title 52, Revised Statutes, acts amendatory thereof or supplemental thereto, rules and regulations thereunder, and the inspection required thereby. (49CFR171)

Offset Parallel Runway: Staggered runways having centerlines which are parallel. (FAA4)

Offshore: That geographic area that lies seaward of the coastline. In general, the coastline is the line of ordinary low water along with that portion of the coast that is in direct contact with the open sea or the line marking the seaward limit of inland water. (49CFR195) (DOE3) (DOE5)

Offshore Control Area: That portion of airspace between the U.S 12-mile limit and the Oceanic Control Area/Flight Information Region (CTA/FIR) boundary within which air traffic control is exercised. These areas are established to permit the application of domestic procedures in the provision of air traffic control services. Offshore Control Area is generally synonymous with Federal Aviation Regulations, Part 71, Subpart E, "Control Areas and Control Area Extensions." (FAA4)

Offshore Supply Vessel: A cargo vessel of less than 500 gross tons that regularly transports goods, supplies or equipment in support of exploration or production of offshore mineral or energy resources. (49CFR171)

OFT: Outer Fix Time (FAA4)

OFZ: Obstacle Free Zone (FAA12)

OGG: Kahului Airport (FAA11)

OH: Overall Height (Of the Vehicle) (TII2) (TII1)

OHC: Over-Head-Cam (TII2) (TII1)

OHMEA: Office of Hazardous Materials Exemptions and Approvals (RSPA1)

OHMS: Office of Hazardous Materials Standards (RSPA1)

OHS: Office of Highway Safety (RSPA1)

OHV: Over-Head-Valve (TII2) (TII1)

OIG: Office of Inspector General (FAA3) (OST2)

Oil: Oil of any kind or in any form, including, and not limited to, petroleum, fuel oil, vegetable oil, animal oil, sludge, oil refuse, oil mixed with wastes other than dredged spoil. (49CFR194)

Oil: A mixture of hydrocarbons usually existing in the liquid state in natural underground pools or reservoirs. Gas is often found in association with oil. (DOE5)

Oil and Gas Production: The lifting of oil and gas to the surface and gathering, treating, field processing (as in the case of processing gas to extract liquid hydrocarbons), and field storage. The production function shall normally be regarded as terminating at the outlet valve on the lease or field production storage tank. If unusual physical or operational circumstances exist, it may be more appropriate to regard the production function as terminating at the first point at which oil, gas, or gas liquids are delivered to a main pipeline, a common carrier, a refinery, or a marine terminal. (DOE5)

Oil Field Body: Heavily constructed platform-type truck body equipped with instruments for oil drilling. (ATA1)

Oil Pipeline Mode: (See also Pipeline) Covers crude oil, petroleum product and gas trunk lines. The pipeline industry, which transports oil and petroleum products, is an important if specialized freight mode. (BTS1)

Oil Spill Removal Organization: An entity that provides response resources. (49CFR194)

OIS: Operational Information System (USCG5)

OKC: Will Rogers World Airport (FAA11)

OM: Outer Marker (FAA4)

OMA: Eppley Airfield (FAA11)

OMB: Office of Management and Budget (BTS2) (FAA19) (NHTSA5)

OMC: Office of Motor Carriers (FHWA10) (NHTSA4) (RSPA1)

Omega: An Area Navigation (RNAV) system designed for long-range navigation based upon ground-based electronic navigational aid signals. (FAA4)

On a Stand: River stationary as to rise or fall. (TNDOT1)

On Course: (See also Off Course, On-Course Indication) 1) Used to indicate that an aircraft is established on the route centerline. 2) Used by Air Traffic Control (ATC) to advise a pilot making a radar approach that his aircraft is lined up on the final approach course. (FAA4)

On Flight Passenger Trip Length: The average length of a passenger trip, calculated by dividing the number of revenue passenger-miles in scheduled service by the number of revenue passenger enplanements in scheduled service. (BTS5) (BTS6)

On-Course Indication: (See also Off Course, On Course) 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. (FAA4)

On-Road Mile Per Gallon (MPG): A composite miles per gallon (MPG) that was adjusted to account for the difference between the test value and the fuel efficiency actually obtained on the road. (DOE4)

On-System: Any point on or directly interconnected with a transportation, storage, or distribution system operated by a natural gas company. (DOE5)

On-Time Performance: The proportion of the time that a transit system adheres to its published schedule times within state tolerances. (TRB1)

On-Track Equipment: Railroad rolling stock used to transport freight or passengers; includes locomotives, railroad cars, maintenance equipment, and one or more locomotives coupled to one or more cars. (FRA3)

ONER: Oceanic Navigational Error Report (FAA4)

Onshore Oil Pipeline Facilities: New and existing pipe, rights-of-way and any equipment, facility, or building used in the transportation of oil located in, on, or under, any land within the United States other than submerged land. (49CFR194)

ONT: Ontario International Airport (FAA11)

OOS: Out-Of-Service (RSPA1)

OPA: Oil Pollution Act of 1990 (MARAD4)

OPEC: Organization for Petroleum Exporting Countries (BTS2) (DOE6)

Open Channel: That portion of the river above pool water. (TNDOT1)

Open Cut: Rail transit way below surface in an excavated cut that has not had a covering constructed over it. Transition segments to open cut or subway-tunnel/tube segments are included. (FTA1)

Open Insurance Policy: A marine insurance policy that applies on all shipments over a period of time rather than on a single shipment. (TNDOT1)


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