| 1 | UTP | Uni-Top Airlines | IATA: UW, Callsign: Uni-Top, Ceased operations on 29 November 2019. | PRC | AVCODES |
| 2 | UTPI | UNIVERSAL TRANSPORT INC | | | SCAC4 |
| 3 | UTPX | Union Texas Petroleum Co. | 1/1980 | | NAKINA |
| 4 | UTPX | Union Texas Petroleum Corp. | added 4/1980; eliminated 10/1984 | | NAKINA |
| 5 | UTPX | Union Texas Products Corp. | added 10/1984; eliminated 10/1986 | | NAKINA |
| 6 | UTPX | Suburban Propane Gas Corp. | eliminated 7/1988 | | NAKINA |
| 7 | UTPX | Suburban Propane-Division of Quantum Chemical Corp. | added 7/1988; 1/1994; eliminated 4/1997 | | NAKINA |
| 8 | UTPX | Suburban Propane L.P. | added 4/1997; 7/2000; eliminated 7/2003; 7/2005 (not listed) | | NAKINA |
| 9 | UTPX | Union Texas Petroleum Co. | Jan-80 | | NRHS |
| 10 | UTPX | Union Texas Petroleum Corp. | added 4/80; eliminated 10/84 | | NRHS |
| 11 | UTPX | Union Texas Products Corp. | added 10/84; eliminated 10/86 | | NRHS |
| 12 | UTPX | Suburban Propane Gas Corp. | eliminated 7/88 | | NRHS |
| 13 | UTPX | Suburban Propane-Division of Quantum Chemical Corp. | added 7/88; 1/94; eliminated 4/97 | | NRHS |
| 14 | UTPX | Suburban Propane L.P. | added 4/97; 7/2000 | | NRHS |
| 15 | UTPX | *UNION TEXAS PETROLEUM CORP. | | | PWRC |
| 16 | UTPX | +SUBURBAN PROPANE - DIV. QUANTUM CHEMICAL CORP. [UNION TEXAS PRODUCTS CORP.] | | | PWRC |
| 17 | UTPX | Union Texas Petroleum Corporation | | | RSRV |
| 18 | UTPZ | TRANSAMERICA LEASING INC | | | SCAC4 |
