| 1 | UNS | Unsped Paket Servisi, Inc. | Callsign: Unsped, | TR | AVCODES |
| 2 | UNS | Unsped Paket Servisi | | | ICAO1 |
| 3 | UNSA | UNISTAR LINE | | | SCAC4 |
| 4 | UNSC | UNISOURCE TRANSPORTATION SERVICES, INC | | | SCAC1 |
| 5 | UNSC | UNIVERSITY OF CALGARY | | | SCAC4 |
| 6 | UNSF | UNISHIPPERS | | | SCAC4 |
| 7 | UNSG | UNISHIPPING | | | SCAC1 |
| 8 | UNSG | UNISHIPPING MARITIME SERVICES | | | SCAC4 |
| 9 | UNSH | UNISHIPPERS | | | SCAC4 |
| 10 | UNSL | UNIVERSAL SHIPPING INC | | | SCAC4 |
| 11 | UNSM | UNISHIPPERS | | | SCAC4 |
| 12 | UNSP | UNIBULK SHIPPING ENTERPRISES S A | | | SCAC4 |
| 13 | UNSQ | UNITED STEEL SERVICE INC | | | SCAC4 |
| 14 | UNST | UNCLE STEVES TRUCKING LLC | | | SCAC4 |
| 15 | UNSU | UNIOCEAN LINES | | GB | BIC |
| 16 | UNSX | Unitrain Services (agent for Iowa Power and Light Co.) | added 10/1980; eliminated 4/1993 | | NAKINA |
| 17 | UNSX | Midwest Power Systems | added 4/1993; 1/1994; eliminated 4/1996 | | NAKINA |
| 18 | UNSX | MidAmerican Energy Co. | added 4/1996; 7/2000; eliminated 4/2003 | | NAKINA |
| 19 | UNSX | JAIX Leasing Co. | added 4/2003; eliminated 1/2004 | | NAKINA |
| 20 | UNSX | Railcar Custom Leasing, LLC | added 1/2004; eliminated 10/2004 | | NAKINA |
| 21 | UNSX | Rail Logistics, LC | added 10/2004; 7/2005 | | NAKINA |
| 22 | UNSX | Unitrain Services (agent for Iowa Power and Light Co.) | added 10/80; eliminated 4/93 | | NRHS |
| 23 | UNSX | Midwest Power Systems | added 4/93; 1/94; eliminated 4/96 | | NRHS |
| 24 | UNSX | MidAmerican Energy Co. | added 4/96; 7/2000 | | NRHS |
| 25 | UNSX | *UNITRAIN SERVICES (AGENT FOR IOWA POWER & LIGHT) | | | PWRC |
| 26 | UNSX | *MIDAMERICAN ENERGY COMPANY [(IOPRX) MIDWEST POWER SYSTEMS] | | | PWRC |
| 27 | UNSX | +RAIL LOGISTICS, LC [RAILCAR CUSTOM LEASING, LLC; JAIX LEASING CO.] | | | PWRC |
| 28 | UNSX | Unitrain Services | | | RSRV |
| 29 | UNSX | RAIL LOGISTICS LC | | | SCAC4 |
