| 1 | UCB | United Caribbean Airlines B.V. | IATA: 4J, Callsign: Eagle Eye, Name changed to United Caribbean Airlines B.V. d/b/a JetAir Caribbean. | CUR | AVCODES |
| 2 | UCB | United Caribbean Airlines B.V. d/b/a JetAir Caribbean | IATA: 4J, Callsign: Eagle Eye, Name changed to Jetair Caribbean B.V. ICAO Designator changed to JRC. Name changed from United Caribbean Airlines B.V. | CUR | AVCODES |
| 3 | UCBC | UNION CITY BODY CO | | | SCAC4 |
| 4 | UCBX | United Carbon Co., Inc. | 7/1935-4/1961; eliminated 10/1963 | | NAKINA |
| 5 | UCBX | United Carbon Co. | added 10/1963; 7/1965-10/1966; eliminated 1/1969 | | NAKINA |
| 6 | UCBX | Ashland Chemical Co., Division of Ashland Oil & Refining Co., Carbon Black & Synthetic Rubber Division | added 1/1969; 4/1970; eliminated 4/1971 | | NAKINA |
| 7 | UCBX | Ashland Chemical Co., Division of Ashland Oil Inc., Carbon Black & Synthetic Rubber Division | added 4/1971; eliminated 7/1971 | | NAKINA |
| 8 | UCBX | Ashland Chemical Co., Division of Ashland Oil Inc. | added 7/1971; 1/1975; eliminated 1/1976 | | NAKINA |
| 9 | UCBX | United Carbon Co., Inc. | 4/38-10/66; eliminated 1/69 | | NRHS |
| 10 | UCBX | Ashland Chemical Co., Division of Ashland Oil & Refining Co., Carbon Black & Synthetic Rubber Division | added 1/69; 4/70; eliminated 4/71 | | NRHS |
| 11 | UCBX | Ashland Chemical Co., Division of Ashland Oil Inc., Carbon Black & Synthetic Rubber Division | added 4/71 | | NRHS |
| 12 | UCBX | Ashland Chemical Co., Division of Ashland Oil Inc. | Jan-75 | | NRHS |
| 13 | UCBX | ASHLAND CHEMICAL CO., CARBON BLACK & SYNTHETIC RUBBER DIV. [UNITED CARBON CO.] | | | PWRC |
| 14 | UCBZ | UNITED COOP OF BIGELOW | | | PWRC |
