| 1 | UAC | United Air Charters | Callsign: Unitair, ICAO designator changed from UAC | ZW | AVCODES |
| 2 | UAC | United Air Charters | | | ICAO1 |
| 3 | UAC | UNITED AIRCRAFT CORP. | | | PWRC |
| 4 | UACB | UNIVERSAL AM-CAN LTD (BROKERAGE DIV | | | SCAC4 |
| 5 | UACL | UNIVERSAL AM-CAN, LTD | | | SCAC1 |
| 6 | UACL | UNIVERSAL AM-CAN LTD | | | SCAC4 |
| 7 | UACS | UNIVERSAL AM-CAN US | | | SCAC4 |
| 8 | UACU | HAPAG LLOYD A.G | | D | BIC |
| 9 | UACU | UNITED ARAB SHIPPERS | | | PWRC |
| 10 | UACU | United Arab Shipping | | | RSRV |
| 11 | UACU | UNITED ARAB SHIPPING CO SAG | | | SCAC4 |
| 12 | UACW | UNITED ARAB CHEMICAL CARRIERS LIMIT | | | SCAC4 |
| 13 | UACX | Universal Atlas Cement Co. | 7/1932; 1/1941-1/1952; eliminated 4/1953 | | NAKINA |
| 14 | UACX | Universal Atlas Cement Division of U.S. Steel Corp. | eliminated 7/1965 | | NAKINA |
| 15 | UACX | Universal Atlas Cement Co. | Jan-52 | | NRHS |
| 16 | UACX | Universal Atlas Cement Division of U.S. Steel Corp. | eliminated 7/65 | | NRHS |
| 17 | UACX | UNIVERSAL ATLAS CEMENT DIV., U.S. STEEL CORP. | | | PWRC |
