| 1 | JT | Lessbrook PTY Ltd., d/b/a Transair | Ceased operations. | AUS | AVCODES |
| 2 | JT | Lion Mentari Airlines, PT. | ICAO: LNI, Callsign: Lion Inter, | RI | AVCODES |
| 3 | JT | Aviation Quebec Labrador LTEE | ICAO: QLA, Callsign: Quebec Labrador, IATA designator changed to QC | CDN | AVCODES |
| 4 | JT | Jamaica Air Services | | JA | AVCODES |
| 5 | JT | Jumbotec GmBH | | DE | VKM |
| 6 | JTA | Japan Transocean Air Co. Ltd. | IATA: NU, Callsign: Jai Ocean, IATA Prefix: 353, | J | AVCODES |
| 7 | JTA | Japan Transocean Air | IATA: NU | | ICAO1 |
| 8 | JTA | Japan Transocean Air | | J | TRAFFIC |
| 9 | JTAF | JONES, MARK TRUCKING | | | SCAC4 |
| 10 | JTAFL | Jacksonville Transportation Authority | | US-FL | TRAFFIC |
| 11 | JTAG | JONES TRANSFER COMPANY INC | | | SCAC4 |
| 12 | JTAI | J & T LOGISTICS INC | | | SCAC4 |
| 13 | JTAJ | JORDDAN TRANSPORT | | | SCAC4 |
| 14 | JTAN | JT AIR TRANSPORT INC | | | SCAC4 |
| 15 | JTAP | JACAMAN TRANSPORTATION INC | | | SCAC4 |
| 16 | JTAQ | JC TRANSPORT | | | SCAC4 |
| 17 | JTAS | J T TRANSPORT | | | SCAC4 |
| 18 | JTAU | JUNTAI CONTAINER COMPANY | | HK | BIC |
| 19 | JTAX | Trinity Rail Management, Inc. | added 7/1997; 7/2000-7/2005; eliminated 1/2007 | | NAKINA |
| 20 | JTAX | Trinity Rail Management, Inc. | added 7/97; 7/2000 | | NRHS |
| 21 | JTAX | *(MCHX) TRANSCISCO LEASING COMPANY | | | PWRC |
| 22 | JTAX | *TRINITY RAIL MANAGEMENT INC | | | PWRC |
| 23 | JTAX | Trinity Rail Management | | | RSRV |
| 24 | JTAY | JACKSON TRUCKING | | | SCAC4 |
| 25 | JTB | Fly Dom N.V. d/b/a Jet Budget | | NA | AVCODES |
| 26 | JTBC | JACOBSON TRANSPORTATION COMPANY (CI | | | SCAC4 |
| 27 | JTBF | JCHG TRANSPORT | | | SCAC4 |
| 28 | JTBI | J T B TRUCKING INC | | | SCAC4 |
| 29 | JTBL | JERRYS TRUCKING | | | SCAC4 |
| 30 | JTBO | JULIO'S TRANSPORT | | | SCAC4 |
| 31 | JTBP | JM TRUCKING | | | SCAC4 |
| 32 | JTBR | JESSES TRANSPORTING LLC | | | SCAC4 |
| 33 | JTBS | JAGUAR TRUCKING LLC | | | SCAC4 |
| 34 | JTBV | JO TANKERS AS | | | SCAC4 |
| 35 | JTBW | JETBLUE AIRWAYS | | | SCAC4 |
| 36 | JTBX | J.T. Baker Chemical Co., Taylor Chemical Division | 4/1947-10/1966; eliminated 4/1969 | | NAKINA |
| 37 | JTBX | J.T. Baker Chemical Co., Taylor Chemical Division | 1/52-10/66; eliminated 4/69 | | NRHS |
| 38 | JTBX | J. T. BAKER CO., TAYLOR CHEMICAL DIV. | | | PWRC |
| 39 | JTBX | BAKER CHEMICAL CO J T TAYLOR DIV | | | SCAC3 |
| 40 | JTC | Jets Corporativos, S.A. de C.V. | Callsign: Corpojets, | MEX | AVCODES |
| 41 | JTC | Jet Trans Aviation (Ghana) Ltd. | Callsign: Jetrans, | GH | AVCODES |
| 42 | JTC | Jetica | Callsign: Jetica, | RUS | AVCODES |
| 43 | JTC | Jet Trans Aviation | | | ICAO1 |
| 44 | JTCA | JT SHIPPING CORPORATION | | | SCAC4 |
| 45 | JTCB | JAMROC TRANSPORTATION CO | | | SCAC4 |
| 46 | JTCE | JERCY TRADING CORP | | | SCAC4 |
| 47 | JTCF | JONES, T C FARMS INC | | | SCAC4 |
| 48 | JTCH | JACKSON TRUCKING CO INC | | | SCAC4 |
| 49 | JTCK | JTC TRUCKING LLC | | | SCAC4 |
| 50 | JTCL | JTC LOGISTICS INC | | | SCAC4 |
| 51 | JTCO | Jacksonville Terminal Co. | 1/1975-7/2005 | | NAKINA |
| 52 | JTCO | Jacksonville Terminal Co. | 1/75-7/2000 | | NRHS |
| 53 | JTCO | JACKSONVILLE TERMINAL CO. | | | PWRC |
| 54 | JTCO | Jacksonville Terminal | | | RSRV |
| 55 | JTCO | Jacksonville Terminal Co. | | USA | TRAFFIC |
| 56 | JTCP | JORDAN TRANSFER COMPANY | | | SCAC4 |
| 57 | JTCQ | JET CORP | | | SCAC4 |
| 58 | JTCR | JACOBSON TRANSPORTATION COMPANY INC | | | SCAC4 |
| 59 | JTCW | JUSTUS TRANSPORT CO INC | | | SCAC4 |
| 60 | JTCX | JUNIATA TERMINAL CO. | | | PWRC |
| 61 | JTCX | JUNIATA TERMINAL COMPANY | | | SCAC4 |
| 62 | JTCY | JACOBSON TRANSPORTATION COMPANY INC | | | SCAC4 |
| 63 | JTD | Jettime A/S | Callsign: New Jet, ICAO Callsign changed to Jet Time. | DK | AVCODES |
| 64 | JTD | Jettime A/S | Callsign: Jet Time, ICAO Callsign changed from New Jet. | DK | AVCODES |
| 65 | JTDA | JENSEN TRANSPORT INC | | | SCAC4 |
| 66 | JTDC | J & T DISTRIBUTORS CORP | | | SCAC4 |
| 67 | JTDF | J & T TRANSPORT INC | | | SCAC4 |
| 68 | JTDH | JET TRANSPORTATION | | | SCAC4 |
| 69 | JTDI | JTDK TRANSPORT INC | | | SCAC4 |
| 70 | JTDK | J T D TRUCKING | | | SCAC4 |
| 71 | JTDM | JOHAL TRUCKING | | | SCAC4 |
| 72 | JTDO | J I T DISTRIBUTING INC | | | SCAC4 |
| 73 | JTDQ | JETER TRUCKING CO. | | | SCAC4 |
| 74 | JTDU | SHANGHAI JIYANG TECHNOLOGY & DEVELOPMENT CO., LTD. | | PRC | BIC |
| 75 | JTDY | JOLENE TRANSPORT | | | SCAC4 |
| 76 | JTDZ | JOINT TEXAS DIVISION | | | PWRC |
| 77 | JTE | National Jet Express t/a Jetex | Callsign: Jetex, Name changed to National Jet Express Pty Limited t/a Cobham Regional Services. | AUS | AVCODES |
| 78 | JTE | National Jet Express Pty Limited t/a Cobham Regional Services | Callsign: Jetex, Name changed from National Jet Express t/a Jetex. | AUS | AVCODES |
| 79 | JTE | National Jet Express | | | ICAO1 |
| 80 | JTEC | J T EXPRESS LOGISTICS | | | SCAC4 |
| 81 | JTED | JACKSON TRUCKING INC | | | SCAC4 |
| 82 | JTEF | JUST TRUCKING IT LLC | | | SCAC4 |
| 83 | JTEG | JOCHEM TRUCKING INC | | | SCAC4 |
| 84 | JTEI | J T EXPRESS INC | | | SCAC4 |
| 85 | JTEP | J T EXPRESS INC | | | SCAC4 |
| 86 | JTEV | JML TRUCKING & EXCAVATING | | | SCAC4 |
| 87 | JTEW | JOE TEX INC | | | SCAC4 |
| 88 | JTF | Jet Time Oy | Callsign: Jetfin, | FIN | AVCODES |
| 89 | JTFA | JAMES TWENTY FOUR (24) HOUR ROAD SE | | | SCAC4 |
| 90 | JTFS | JUNIATA TERMINAL COMPANY, INC. | | | PWRC |
| 91 | JTFS | JENKINS TRANSFER & STORAGE INC | | | SCAC4 |
| 92 | JTFX | Joseph Leasing Ltd. | added 1/2003; 7/2005; eliminated 1/2006 | | NAKINA |
| 93 | JTFX | JOSEPH LEASING, LTD. | | | PWRC |
| 94 | JTFX | Joseph Leasing | | | RSRV |
| 95 | JTG | Jet Time A/S | IATA: J4, Callsign: Jettime, Commenced operations on 19 September 2006. Filed for bankruptcy on 21 July 2020. | DK | AVCODES |
| 96 | JTG | Jettime | | | ICAO1 |
| 97 | JTGC | JET TRANSPORT SERVICES INC | | | SCAC4 |
| 98 | JTGK | J T G TRUCKING | | | SCAC4 |
| 99 | JTGU | NINGBO JUTONG CONTAINER TECHNOLOGY CO.,LTD. | | PRC | BIC |
| 100 | JTHM | JOHNSON, THOMAS M. | | | SCAC1 |
