| 1 | JC | JAL Express | ICAO: JEX, Callsign: Janex, IATA Prefix: 688, Merged to Japan Airlines w.e.f. 30 September 2014. | J | AVCODES |
| 2 | JC | Rocky Mountain Airways | ICAO: RMA, Callsign: Rocky Mountain, Merged into Britt Airways to form Continental Express during 1991. Founded in 1963. Commenced operations in 1965. | USA | AVCODES |
| 3 | JC | Jamair Company Ltd. | Callsign: Jamair, Ceased Operations | IND | AVCODES |
| 4 | JC | All Seasons Aviation Limited | ICAO: ASG, Callsign: All Seasons, | GB | AVCODES |
| 5 | JC | Japan Air Commuter Co. Ltd. | ICAO: JAC, Callsign: Commuter, IATA designator changed from 3X. | J | AVCODES |
| 6 | JC | Jura-Cement-Fabriken | | CH | VKM |
| 7 | JCA | Jetcom SA | Callsign: Jetcom, | CH | AVCODES |
| 8 | JCA | Jetcontact Luftfahrtbetriebs und Vermittlungs GmbH | Callsign: Jetjaco, | A | AVCODES |
| 9 | JCA | Jet Power Aruba Charters & Transportation Company V.B.A. | Callsign: Spartan, | ARU | AVCODES |
| 10 | JCAB | Japan Civil Aviation Bureau | | J | TRAFFIC |
| 11 | JCAE | J C TRUCKING | | | SCAC4 |
| 12 | JCAK | JCA TRUCKING | | | SCAC4 |
| 13 | JCAO | JCK TRANSPORTATION INC | | | SCAC4 |
| 14 | JCB | J C Bamford Excavators Ltd. | Callsign: JayCeeBee, | GB | AVCODES |
| 15 | JCB | J C Bamford (Excavators) | | | ICAO1 |
| 16 | JCBE | JACOB EXPRESS | | | SCAC4 |
| 17 | JCBF | JACOBSON TRANSFER | | | SCAC4 |
| 18 | JCBH | JCB TRANSPORTATION INC | | | SCAC4 |
| 19 | JCBK | JBCI TRUCKING INC | | | SCAC4 |
| 20 | JCBN | JCB TRANSPORTATION LLC | | | SCAC4 |
| 21 | JCBO | JACOBS, MARK TRANSPORTATION | | | SCAC4 |
| 22 | JCBP | J C B TRANSPORT INC | | | SCAC4 |
| 23 | JCBQ | JENSEN CUSTOMS BROKERS CANADA INC | | | SCAC4 |
| 24 | JCBR | JEFFERSON & CYPRESS BAYOU RAILROAD | | | PWRC |
| 25 | JCBS | JACOBS, TIM | | | SCAC4 |
| 26 | JCBU | CARLSBERG DANMARK A/S | | | SCAC4 |
| 27 | JCBY | JACKSON, MARSHA M | | | SCAC4 |
| 28 | JCC | Jetcraft Aviation | Callsign: Jetcraft, | AUS | AVCODES |
| 29 | JCC | JC (Cambodia) International Airlines | IATA: QD, Callsign: Cambo, Planned startup subject to licence approval in April 2017. | K | AVCODES |
| 30 | JCC | Jetcraft Aviation | | | ICAO1 |
| 31 | JCCB | JESUS CHRIST CARRIERS LLC | | | SCAC4 |
| 32 | JCCC | JOYCE CAR CARRIER CORPORATION | | | SCAC4 |
| 33 | JCCD | JONES, C C PRODUCE TRUCKING | | | SCAC4 |
| 34 | JCCF | JEMA CARGO COMPANIES INC | | | SCAC4 |
| 35 | JCCH | JRS CONTRACTING CO INC | | | SCAC4 |
| 36 | JCCL | JIF LOGISTICS INC | | | SCAC4 |
| 37 | JCCM | COLEGRAVE CONTAINER LEASE MANAGEMEN | | | SCAC3 |
| 38 | JCCM | JCC TRANSPORT | | | SCAC4 |
| 39 | JCCR | JETCLUB CARGO | | | SCAC4 |
| 40 | JCCV | J & C CUSTOM DELIVERIES INC | | | SCAC4 |
| 41 | JCCX | JEFFERSON CHEMICAL CO. | | | PWRC |
| 42 | JCDB | JOHNSON CONOCO DISTRIBUTORS INC | | | SCAC4 |
| 43 | JCDX | Jefferson County Drainage District No. 6 | 7/2005 (not listed) | | NAKINA |
| 44 | JCDX | JEFFERSON COUNTY DRAINAGE DISTRICT NO. 6 | | | PWRC |
| 45 | JCDX | Jefferson County Drainage District No. 6 | | | RSRV |
| 46 | JCDX | JEFFERSON COUNTY DRAINAGE DISTRICT | | | SCAC4 |
| 47 | JCDY | J C DELIVERY INC | | | SCAC4 |
| 48 | JCEI | J C EXPRESS ENTERPRISE INC | | | SCAC4 |
| 49 | JCEQ | JIMCO CONSTRUCTION & EQUIPMENT RENT | | | SCAC4 |
| 50 | JCEX | John S. Carlson and Co., Inc. | added 4/1981; eliminated 1/1986 | | NAKINA |
| 51 | JCEX | John S. Carlson and Co., Inc. | added 4/81; eliminated 1/86 | | NRHS |
| 52 | JCEX | JOHN S. CARLSON & COMPANY, INC. | | | PWRC |
| 53 | JCEX | John S. Carlson and | | | RSRV |
| 54 | JCEX | AEROSERVICIOS EJECTUTIVOS CORPORATI | | | SCAC4 |
| 55 | JCF | Jet Center Flight Training, S.A. | Callsign: Jet Center, | E | AVCODES |
| 56 | JCF | Jet Center Flight Training | | | ICAO1 |
| 57 | JCFA | JAMES, CAROLINE FINE ART STUDIO | | | SCAC4 |
| 58 | JCFI | JOHNSON, C F INC | | | SCAC4 |
| 59 | JCFM | JC FOUR (4) ME LLC | | | SCAC4 |
| 60 | JCFO | JACQUAR FUEL OIL LLC | | | SCAC4 |
| 61 | JCFS | J C FIBERS INC | | | SCAC4 |
| 62 | JCFU | NEW INTER COMERCIO E SERVICOS LTDA | | BR | BIC |
| 63 | JCFU | JC FRAGOSO REPAROS ME | | | SCAC4 |
| 64 | JCFX | J. Francesconi & Co. (General American Transportation Corp.) | 8/1920 | | NAKINA |
| 65 | JCFX | J. FRANCESCONI & CO. (GENERAL AMERICAN TRANSPORTATION CORP.) | | | PWRC |
| 66 | JCG | Japan Coast guard | | J | TRAFFIC |
| 67 | JCGS | JUST CARGO XPRESS INC | | | SCAC4 |
| 68 | JCGU | JENGCO SDN BHD | | | SCAC4 |
| 69 | JCGX | River City Leasing, Inc. | 7/2005 (not listed) | | NAKINA |
| 70 | JCGX | RIVER CITY LEASING, INC. | | | PWRC |
| 71 | JCGX | RIVER CITY LEASING INC | | | SCAC4 |
| 72 | JCH | Trading Air Cargo | Callsign: Trading Cargo, | RIM | AVCODES |
| 73 | JCH | Trading Air Cargo | | | ICAO1 |
| 74 | JCHG | JONES, CHARLES G | | | SCAC4 |
| 75 | JCHU | CHEVALLIER | | | SCAC3 |
| 76 | JCHX | J.C. Hubinger Co. (General American Tank Car Corp.) | added 11/1934 | | NAKINA |
| 77 | JCHX | J.C. HUBINGER CO. (GENERAL AMERICAN TANK CAR CORP.) | | | PWRC |
| 78 | JCI | Jordan International Air Cargo Company (JIAC) | IATA: J4, IATA Prefix: 660, | JOR | AVCODES |
| 79 | JCI | Jordan International Air Cargo | | | ICAO1 |
| 80 | JCIE | JONOCO COPIER INC | | | SCAC4 |
| 81 | JCIL | JCI LOGISTICS LLC | | | SCAC4 |
| 82 | JCIS | JS CONSULTANTS INC | | | SCAC4 |
| 83 | JCIX | Jones Chemicals, Inc. | added 7/1962; 7/1965-1/1980; eliminated 7/1984 | | NAKINA |
| 84 | JCIX | Jones Chemicals, Inc. | 7/65-1/80; eliminated 7/84 | | NRHS |
| 85 | JCIX | JONES CHEMICALS, INC. | | | PWRC |
| 86 | JCIX | Jones Chemicals | | | RSRV |
| 87 | JCJU | CASHIHOR ENTERPRISE CO LTD | | RC | BIC |
| 88 | JCK | Jackson Air Services Ltd. | Callsign: Jackson, | CDN | AVCODES |
| 89 | JCK | Jackson Air Services | | | ICAO1 |
| 90 | JCKA | JACOBS TRUCKING INC | | | SCAC4 |
| 91 | JCKG | JONES BROTHERS TRUCKING L P | | | SCAC4 |
| 92 | JCKL | JACKSON TRUCKING | | | SCAC4 |
| 93 | JCKM | JAMES, CECIL TRUCKING | | | SCAC4 |
| 94 | JCKN | JACKSON MOVING & STORAGE INC | | | SCAC4 |
| 95 | JCKO | JACKSON TRUCKING CO | | | SCAC1 |
| 96 | JCKO | JACKSON INTERNATIONAL LTD | | | SCAC4 |
| 97 | JCKR | JACKSON TRANSPORTATION | | | SCAC4 |
| 98 | JCL | Jet Cargo-Liberia | | LB | AVCODES |
| 99 | JCL | Jetcall GmbH & Co. KG. | Callsign: Jetcall, | D | AVCODES |
| 100 | JCLB | JGS CARRIERS LLC | | | SCAC4 |
