| 1 | UBT | Norse Atlantic UK Limited | IATA: Z0, Callsign: Longboat, IATA Prefix: 536, Subsidiary of Norse Atlantic Airways AS. AOC grant 23 September 2022. | GB | AVCODES |
| 2 | UBTA | UGLAND BULK TRANSPORT A/S | | | SCAC4 |
| 3 | UBTE | UTLEY, BRENT TRUCKING | | | SCAC4 |
| 4 | UBTK | US BOND TRUCKING INC | | | SCAC4 |
| 5 | UBTN | URBAN TANKER CORPORATION | | | SCAC4 |
| 6 | UBTO | UNITED BRIDGE TRUCKING CORP | | | SCAC4 |
| 7 | UBTT | UNCLE BEN TRANSPORT INC | | | SCAC4 |
| 8 | UBTX | Union Bag & Paper Corp. | added 7/1955; eliminated 10/1956 | | NAKINA |
| 9 | UBTX | Union Bag-Camp Paper Corp. | added 10/1956; 10/1957-7/1965; eliminated 7/1966 | | NAKINA |
| 10 | UBTX | Union Camp Corp. | added 7/1966; 10/1966-1/1980; eliminated 10/1987 | | NAKINA |
| 11 | UBTX | Union Bag & Paper Corp. | added 7/55 | | NRHS |
| 12 | UBTX | Union Bag-Camp Paper Corp. | 10/57-7/65; eliminated 7/66 | | NRHS |
| 13 | UBTX | Union Camp Corp. | added 7/66; 10/66-1/80; eliminated 10/87 | | NRHS |
| 14 | UBTX | UNION CAMP CORP. [UNION BAG & PAPER CORP.] | | | PWRC |
| 15 | UBTX | Union Camp Corporation | | | RSRV |
| 16 | UBTX | UNION BAY-CAMP PAPER CORP | | | SCAC4 |
