| 1 | UCM | University of Central Missouri | Callsign: Mule Flight, | USA | AVCODES |
| 2 | UCM | UNION CARBIDE (WEST VIRGINIA) | | | PWRC |
| 3 | UCMI | UNITED CARGO MANAGEMENT INC | | | SCAC4 |
| 4 | UCMR | UCM RESITA SA | | RO | VKM |
| 5 | UCMX | United Commercial Co., Inc. | 7/1930-4/1938 | | NAKINA |
| 6 | UCMX | United Clays, Inc. | added 7/1990; 1/1994-7/2000; eliminated 1/2002; 7/2005 (not listed) | | NAKINA |
| 7 | UCMX | United Commercial Co., Inc. | Apr-38 | | NRHS |
| 8 | UCMX | United Clays, Inc. | added 7/90; 1/94-7/2000 | | NRHS |
| 9 | UCMX | UNITED CLAYS, INC. | | | PWRC |
| 10 | UCMX | United Clays | | | RSRV |
