| SCR |
 An abbreviation for Specific Commodity Rate. |
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| Schedule B Commodity Number |
| A seven-digit number assigned by U.S. customs identifying all forms of goods for export. It is entered on the shipper's export declaration by the shipper or his agent. |
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| Schedule Change |
| Changes to flight departure and/or arrival times, and/or to flight numbers, resulting from revision to operational plans. |
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| Security Endorsement |
| A statement signed by a shipper certifying that the shipment being tendered does not contain any unauthorized explosives, destructive devices, or hazardous materials. |
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| Security Summary |
| Document provided by an FAA-approved indirect air carrier which includes their FAA approval number, the number of known shippers, number and names of unknown shippers, items which weigh under 16 oz., Air Waybill number, and a statement certifying the indirect air carrier is in compliance with Section III.C of the FAA Indirect Air Carrier Security Program. |
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| SED |
| An abbreviation for Shipper's Export Declaration. |
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| Shipper's Export Declaration - (SED) |
| Form required for all U.S. exports with declared value for Customs greater than $2,500 and for household and personal goods regardless of value. Also required for shipments requiring a U.S. Department of Commerce validated export license or U.S. Department of Justice Drug Enforcement export declaration. Prepared by a shipper indicating the value, weight destination and other basic information about the shipment. SED forms may be obtained from most U.S. Customs Offices. |
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| Shipper |
| A customer shipping goods. |
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| Shipper's Documentation |
| Documents or paperwork that must accompany a shipment, usually referring to documents for international shipping. |
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| Shuttle Truck/Substitute Truck |
| A truck which operates between two United Airlines airports in lieu of a flight. |
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| Signature Service |
| A service performed by United for government agency shipments upon request. At each step of shipping process from origin to destination, a United Airlines employee or agent for United Airlines signs the receipt. |
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| SITC |
| An abbreviation for Standard International Trade Classification. |
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| Small Package Delivery |
| A service offered by United for the movement of small, single package shipments which guarantees specific flight forwarding. |
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| Special Pick-Up/Delivery Service - (ACI) |
| Provides surface transport of shipments from cargo terminal to shipper/consignee door at a specified time. It requires advance arrangements and is subject to the regular pick-up/delivery charge, plus an added fee. |
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| Specific Commodity Rate |
| A special rate, usually lower than the general commodity rate, for certain commodities such as fish, flowers, etc. |
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| SPD |
| An abbreviation for Small Package Delivery. |
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| Split Shipments |
| When parts of one shipment under one master Air Waybill arrive into a country on separate flight/dates and/or gateways. |
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| Stall |
| A custom-built structure for larger live animals. See IATA, Live Animal Regulations. |
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| Standard International Trade Classification |
| A numeric code developed by the United Nations and adopted by the U.S. scheduled airlines as a basis for numerical identification of commodities moving as cargo. The code is entered on the Air Waybill at origin. |
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| Standard Truck |
| A truck with a standard enclosed trailer. |
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| Station |
| A commonly used term for an airport city. |
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| Stretch Aircraft |
| Airline term referring to B-727-200 and B-737-300 United aircraft. |
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| System |
| In airline language it means the complete route structure of a specific airline. |
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