| 1 | UCO | Linea Aerea del Cobre Ltda. (LADECO) | IATA: UC, Callsign: Ladeco, | RCH | AVCODES |
| 2 | UCO | Ucoaviacion | | | ICAO1 |
| 3 | UCOI | UNITED CENTRAL ORCHIDS INC | | | SCAC4 |
| 4 | UCOP | UNITED COOPERATIVES INC | | | SCAC4 |
| 5 | UCOX | Union Carbide Corp., Chemicals Division | added 7/1964; 7/1965-10/1966; eliminated 10/1967 | | NAKINA |
| 6 | UCOX | Union Carbide Corp., Chemicals and Plastics | added 10/1967; eliminated 1/1968 | | NAKINA |
| 7 | UCOX | Union Carbide Corp., Chemicals and Plastics Operations Division | added 1/1968; 4/1970-1/1975; eliminated 1/1979 | | NAKINA |
| 8 | UCOX | Union Carbide Corp., Chemicals and Plastics Division | added 1/1979; 1/1980; eliminated 7/1980 | | NAKINA |
| 9 | UCOX | Union Carbide Corp. | added 7/1980; eliminated 10/1980 | | NAKINA |
| 10 | UCOX | Union Carbide Corp., Chemicals and Plastics Division | added 10/1980; eliminated 5/1983 | | NAKINA |
| 11 | UCOX | Union Carbide Corp. | added 5/1983 | | NAKINA |
| 12 | UCOX | Union Carbide Corp., Chemicals and Plastics Co., Inc. | eliminated 1/1993 | | NAKINA |
| 13 | UCOX | Praxair, Inc. | added 1/1993; 1/1994; eliminated 4/1996; 7/2000 (not listed); 7/2005 | | NAKINA |
| 14 | UCOX | Union Carbide Corp., Chemicals Division | added 7/64; 7/65-10/66; eliminated 10/67 | | NRHS |
| 15 | UCOX | Union Carbide Corp., Chemicals and Plastics | added 10/67; eliminated 1/68 | | NRHS |
| 16 | UCOX | Union Carbide Corp., Chemicals and Plastics Operations Division | added 1/68; 4/70-1/75; eliminated 1/79 | | NRHS |
| 17 | UCOX | Union Carbide Corp., Chemicals and Plastics Division | added 1/79; 1/80; eliminated 7/80 | | NRHS |
| 18 | UCOX | Union Carbide Corp. | added 7/80; eliminated 10/80 | | NRHS |
| 19 | UCOX | Union Carbide Corp., Chemicals and Plastics Division | added 10/80; eliminated 5/83 | | NRHS |
| 20 | UCOX | Union Carbide Corp. | added 5/83 | | NRHS |
| 21 | UCOX | Union Carbide Corp., Chemicals and Plastics Co., Inc. | eliminated 1/93 | | NRHS |
| 22 | UCOX | Praxair, Inc. | added 1/93; 1/94; eliminated 4/96; 7/2000 | | NRHS |
| 23 | UCOX | PRAXAIR, INC. [UNION CARBIDE CORP.] | | | PWRC |
| 24 | UCOX | Union Carbide Corporation | | | RSRV |
| 25 | UCOX | PRAXAIR INC | | | SCAC4 |