| 1 | CZ | China Southern Airlines | ICAO: CSN, Callsign: China Southern, IATA Prefix: 784, Formerly CAAC Guangzhow region | PRC | AVCODES |
| 2 | CZ | Business Flights | ICAO: BFA, Callsign: Chinookair, | CDN | AVCODES |
| 3 | CZ | Cambata Aviation Ltd. | | IND | AVCODES |
| 4 | CZ | Coahuila & Zacetecas Ry. | 1/1975-1/1980 | | NAKINA |
| 5 | CZ | Coahuila & Zacetecas Ry. | 1/75-1/80 | | NRHS |
| 6 | CZ | *COAHUILA & ZACATECAS RAILWAY | | | PWRC |
| 7 | CZ | *CROWN ZELLERBACH CORP. | | | PWRC |
| 8 | CZ | Coahuila and Zacatecas Railway | | | RSRV |
| 9 | CZA | Czech Army | | CZ | TRAFFIC |
| 10 | CZA | Club 1018 | | AT | VKM |
| 11 | CZAG | CHAVEZ, ADAN G JR | | | SCAC3 |
| 12 | CZAG | CRUCES INTERNACIONALES BEZA | | | SCAC4 |
| 13 | CZAL | CARRIZALES SEGOVIA, CLAUDIA DEYANIR | | | SCAC4 |
| 14 | CZAT | CUSTOMIZED AIRPORT TRANSPORTATION S | | | SCAC3 |
| 15 | CZAWDAR | Czawdar | | BG | TRAFFIC |
| 16 | CZCL | C Z C LTD | | | SCAC3 |
| 17 | CZCR | CZCOURIER LTD | | | SCAC3 |
| 18 | CZCX | Crown Zellerbach Corp. | added 10/1960; 4/1961-1/1980; eliminated 5/1983; 1/1994-7/2005 (not listed) | | NAKINA |
| 19 | CZCX | Gaylord Container Division, Crown Zellerbach Corp. | added 7/1960; eliminated 10/1960 | | NAKINA |
| 20 | CZCX | Gaylord Container Division, Crown Zellerbach Corp. | added 7/60; eliminated 10/60 | | NRHS |
| 21 | CZCX | Crown Zellerbach Corp. | added 10/60; 4/61-1/80; eliminated 5/83; 1/94-7/2000 | | NRHS |
| 22 | CZCX | CROWN ZELLERBACH CORP. GAYLORD CONTAINER DIV. | | | PWRC |
| 23 | CZCX | Crown Zellerbach Corporation | | | RSRV |
| 24 | CZCX | CROWN ZELLERBACH CORP | | | SCAC3 |
| 25 | CZCX | Crown Zellerbach Corp. | | USA | TRAFFIC |
| 26 | CZDE | COMAZZETTO, DARRELL ERIC | | | SCAC4 |
| 27 | CZDZ | Przedsiębiorstwo Komunikacji Miejskiej w Czechowicach-Dziedzicach sp. z o.o. | | PL | TRAFFIC |
| 28 | CZEC | CZECHMATE LOGISTICS ENTERPRISES INC | | | SCAC4 |
| 29 | CZEI | COOL ZERO EXPRESS INC | | | SCAC4 |
| 30 | CZEN | CITIZENS TRANSFER & STORAGE COMPANY | | | SCAC3 |
| 31 | CZEN | Miejskie Przedsiębiorstwo Komunikacyjne w Częstochowie | City: Czestochowa, From 1991 for a short time the company's name was Miejski Zakład Komunikacji, also MZK | PL | TRAFFIC |
| 32 | CZER | CZER TRANSPORT INC | | | SCAC4 |
| 33 | CZET | CZECH TRANS INC | | | SCAC4 |
| 34 | CZEV | CHAVEZ PEREZ, ROBERTO | | | SCAC4 |
| 35 | CZFA | CROZIER FINE ARTS | | | SCAC3 |
| 36 | CZFI | CIZMAR FREIGHT INC | | | SCAC4 |
| 37 | CZFL | COMERCILIZADORA FALCON LLC | | | SCAC4 |
| 38 | CZGC | CAZGO CARRIERS | | | SCAC4 |
| 39 | CZHN | CRUZ, HENRY TRUCKING | | | SCAC3 |
| 40 | CZHT | CRAZY HORSE TRUCKING | | | SCAC3 |
| 41 | CZIA | CORAZZINI ASPHALT INC | | | SCAC4 |
| 42 | CZII | CRUZ INTERNATIONAL INC. | | | SCAC3 |
| 43 | CZIN | C Z INC | | | SCAC3 |
| 44 | CZJB | CAZARY, J B INC | | | SCAC3 |
| 45 | CZL | CZ LOKO a.s. | | CZ | TRAFFIC |
| 46 | CZL | CZ Logistics, s.r.o. | | CZ | VKM |
| 47 | CZLC | CARTER ZONE LLC | | | SCAC4 |
| 48 | CZLPL | CZ LOKO Polska Sp. z o.o. | | PL | VKM |
| 49 | CZLU | CMA-CGM | | F | BIC |
| 50 | CZLU | BASCO SHIPPING AND TRADE SA | | | SCAC4 |
| 51 | CZME | CZECH ZOOM EXPRESS LTD | | | SCAC4 |
| 52 | CZML | CORTEZ, MANUEL | | | SCAC4 |
| 53 | CZMM | CRUZ MEDINA, MANUEL | | | SCAC4 |
| 54 | CZMS | CITIZENS MOVING & STORAGE INC | | | SCAC3 |
| 55 | CZMT | CARDOZA, MIKE TRUCKING INC | | | SCAC3 |
| 56 | CZNC | COUZENS CARTAGE INC | | | SCAC3 |
| 57 | CZNE | CORZINE, CARL E AND PHILLIP RAY | | | SCAC3 |
| 58 | CZNG | CITIZEN LOGISTICS | | | SCAC4 |
| 59 | CZNL | COUZINS LIMITED | | | SCAC3 |
| 60 | CZOL | CORZO LOGISTICS LLC | | | SCAC4 |
| 61 | CZON | CRUZ ON TRUCKING INC | | | SCAC4 |
| 62 | CZOS | CZECHOSLOVAK OCEAN SHIPPING | | | SCAC3 |
| 63 | CZPB | CZAPLEWSKI BROS INC | | | SCAC3 |
| 64 | CZPR | CRUZ PEDREGON RACING INC | | | SCAC4 |
| 65 | CZPS | CRUZ PEREZ, SERGIO CESAR | | | SCAC4 |
| 66 | CZPU | CONZEPT CONTAINER MODULBAU & HANDEL GMBH | | A | BIC |
| 67 | CZR | Centar Za Reciklažu, Beograd | | RS | VKM |
| 68 | CZRA | CRUZ RASCON, RAMON | | | SCAC4 |
| 69 | CZRC | CRUZ CONSTRUCTION INC | | | SCAC4 |
| 70 | CZRI | CIZMAR INC | | | SCAC4 |
| 71 | CZRQ | CISZAR CARTAGE COMPANY | | | SCAC3 |
| 72 | CZRS | CZARS DELIVERY | | | SCAC3 |
| 73 | CZRY | Carrizo Gorge Ry. Inc. | 7/2005 | | NAKINA |
| 74 | CZRY | CARRIZO GORGE RAILWAY | | | PWRC |
| 75 | CZRY | Carrizo Gorge Railway | | | RSRV |
| 76 | CZRY | CARRIZO GORGE RAILWAY INC | | | SCAC4 |
| 77 | CZSC | CENTRANS SERVICE CORP | | | SCAC3 |
| 78 | CZSF | CORTEZ SEA FOOD SA DE CV | | | SCAC4 |
| 79 | CZTC | C-Z TRUCKING CO | | | SCAC3 |
| 80 | CZTI | COBLENTZ TRANSPORT INC | | | SCAC4 |
| 81 | CZTK | CASAREZ TRUCKING | | | SCAC4 |
| 82 | CZTL | CTL TRANSPORTATION SERVICE | | | SCAC4 |
| 83 | CZTN | CSISZNERS TRUCKIN | | | SCAC3 |
| 84 | CZTN | CITIZEN TRANSPORTATION INC | | | SCAC4 |
| 85 | CZTP | CLONTZ TRANSPORTATION | | | SCAC4 |
| 86 | CZTQ | CITIZENS TRANSFER & STORAGE CO INC | | | SCAC4 |
| 87 | CZTR | CIRCLE Z TRUCKING | | | SCAC3 |
| 88 | CZTS | CUSTOMIZED TRANSPORTATION SOLUTIONS | | | SCAC4 |
| 89 | CZTU | NEW CENTRANS INTERNATIONAL MARINE SHIPPING CO., LIMITED | | HK | BIC |
| 90 | CZTU | CENTRANS INTERNATIONAL MARINE SHIPP | | | SCAC4 |
| 91 | CZVN | CAN ZAC AVIATION LTD | | | SCAC4 |
| 92 | CZXI | CZ TRANSPORT INC | | | SCAC4 |
| 93 | CZZN | CIZZON INTERNATIONAL CHICAGO ILL | | | SCAC3 |
| 94 | CZZU | CAI INTERNATIONAL | | USA | BIC |
| 95 | CZZU | Cai International | | | RSRV |
| 96 | CZZU | CONTAINER APPLICATIONS INTERNATIONA | | | SCAC4 |
