| OA - Other Airline |
 Term used to refer to an airline other than United. See OFFLINE. |
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| Offline |
| Term used referring to other airlines. |
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| Offload |
| Removing the cargo from the aircraft. |
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| On-Demand Truck |
| A shuttle truck operating only if freight has been booked for it. |
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| On Hand - (OH) |
| Cargo is confirmed at a particular airport and available for the customer to pick-up. |
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| One-Shot Truck |
| A shuttle truck arranged by a station on a one-time only basis. |
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| Online |
| A routing from origin to destination on United only. |
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| Origin |
| The point at which a shipment begins. |
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| Over-Pivot Weight |
| The weight in excess of the pivot weight. See Pivot Weight. |
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| Over-the-Road Truck |
| Pick-up and delivery service performed beyond the usual radius of regular Air Cargo, Inc. pick-up and delivery service. These shipments are normally by use of a bill of lading or PRO. |
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