| 1 | CIT | City-Jet Luftfahrtgesellschaft m.b.H. | Callsign: Cityvienna, | A | AVCODES |
| 2 | CIT | Inter City Airlines | IATA: QA, Callsign: Quebec Alpha, Ceased operations in August 1983. Name changed from Alidair | GB | AVCODES |
| 3 | CIT | Zanesville Aviation | Callsign: Zane, Ceased operations. Name changed from SouthEastern Ohio Air Service, Inc. d/b/a Zanesville Aviation. | USA | AVCODES |
| 4 | CIT | SouthEastern Ohio Air Service, Inc. d/b/a Zanesville Aviation | Callsign: Zane, Name changed to Zanesville Aviation. | USA | AVCODES |
| 5 | CIT | Citroen | | | TRAFFIC |
| 6 | CITA | CITY TRANSFER & STORAGE CO | | | SCAC3 |
| 7 | CITA | C & I TRANSPORTATION | | | SCAC4 |
| 8 | CITC | CITIZENS CARPET SERVICE | | | SCAC3 |
| 9 | CITC | City-Trafik | City: Copenhagen | DK | TRAFFIC |
| 10 | CITD | COLE INTERSTATE TRUCKING COMPANY IN | | | SCAC3 |
| 11 | CITE | CITIZENS EXPRESS INC | | | SCAC3 |
| 12 | CITE | CITERNES EXPERTS INC | | | SCAC4 |
| 13 | CITEV | Compagnie Internationale des Trains Express a Vapeur | | F | TRAFFIC |
| 14 | CITF | CITY TRANSFER COMPANY LTD | | | SCAC3 |
| 15 | CITH | CITCHER TRANSPORTATION CO, INC | | | SCAC3 |
| 16 | CITH | CIT CHARTERS INC | | | SCAC4 |
| 17 | CITI | CITIES SERVICE PIPE LINE COMPANY | | | SCAC3 |
| 18 | CITJ | CINTRAN INC | | | SCAC3 |
| 19 | CITJ | CITYSPRINT 1.800.DELIVER | | | SCAC4 |
| 20 | CITK | CITY TRANSFER COMPANY INC | | | SCAC3 |
| 21 | CITK | CITATION KITCHENS | | | SCAC4 |
| 22 | CITM | CRISIS TRANSPORTATION COMPANY | | | SCAC3 |
| 23 | CITN | COLORADO INTERNATIONAL TRANSPORT IN | | | SCAC4 |
| 24 | CITO | CITY TRANSFER CO INC | | | SCAC3 |
| 25 | CITO | CITY TRANSFER CO INC | | | SCAC4 |
| 26 | CITP | CAROLINA TRANSIT INC | | | SCAC4 |
| 27 | CITQ | CITY TRANSFER CO | | | SCAC3 |
| 28 | CITR | C & I TRUCKING | | | SCAC3 |
| 29 | CITR | CRITES, | | | SCAC4 |
| 30 | CITR | Cityrama | | GB | TRAFFIC |
| 31 | CITR | CONSTRUCCIONES INSTALACIÓN Y TRACCIÓN, S.A.U. | | ES | VKM |
| 32 | CITS | CITY TRANSFER & STORAGE CO | | | SCAC3 |
| 33 | CITS | CORREO INTERNATIONAL TRUCKING S DE | | | SCAC4 |
| 34 | CITT | CONCEPT INTERNATIONAL TRANSPORTATIO | | | SCAC4 |
| 35 | CITU | CIMC SAFEWAY TECHNOLOGIES CO., LTD. | | PRC | BIC |
| 36 | CITU | CITROEN [ANDRE CITROEN] | | | PWRC |
| 37 | CITU | CINCINNATI UNION TERMINAL | | | PWRC |
| 38 | CITU | Citroën | | | RSRV |
| 39 | CITU | CITROEN | | | SCAC3 |
| 40 | CITU | COMPANIA IBERICA DE TRANSPORTES ESP | | | SCAC4 |
| 41 | CITV | CTS INTERNATIONAL LOGISTICS CORPORA | | | SCAC4 |
| 42 | CITW | CASTLE INTERNATIONAL CO LTD | | | SCAC4 |
| 43 | CITX | The CIT Group/Capital Finance, Inc. | added 1/2006 | | NAKINA |
| 44 | CITX | PLM International, Inc. | added 4/1991; 1/1994-7/2005; eliminated 1/2006 | | NAKINA |
| 45 | CITX | PLM Railcar Management Services Canada Limited | added 1/1987; eliminated 4/1991 | | NAKINA |
| 46 | CITX | PLM Railcar Management Services Canada Limited | added 1/87; eliminated 4/91 | | NRHS |
| 47 | CITX | PLM International, Inc. | added 4/91; 1/94-7/2000 | | NRHS |
| 48 | CITX | *CITY OF ATLANTA RAILROAD | | | PWRC |
| 49 | CITX | +THE CIT GROUP/CAPITAL FINANCE, INC. [(PLMX) PLM INTERNATIONAL, INC.] | | | PWRC |
| 50 | CITX | CIT Group | | | RSRV |
| 51 | CITX | CITY GROUP/CAPITAL FINANCE INC, THE | | | SCAC4 |
| 52 | CITX | The CIT Group/Capital Finance, Inc. | | USA | TRAFFIC |
| 53 | CITY | CSDL INC | | | SCAC4 |
| 54 | CITYTR | City-Trafik A/S, Copenhagen | | DK | TRAFFIC |
| 55 | CITZ | CITEC | | | PWRC |
