| 7601 | CIME | CASCADE INTERMOUNTAIN EXPRESS | | | SCAC3 |
| 7602 | CIME | CIMETRA LLC | | | SCAC4 |
| 7603 | CIMF | CIMON TRANSPORT INC | | | SCAC3 |
| 7604 | CIMF | CIMA LOGISTICS LLC | | | SCAC4 |
| 7605 | CIMG | CITY MOVING & STORAGE | | | SCAC3 |
| 7606 | CIMG | CITY MOVING & STORAGE | | | SCAC4 |
| 7607 | CIMH | CIRCLE MOVING & STORAGE INC | | | SCAC3 |
| 7608 | CIMI | CINIMOD TRUCKING INC | | | SCAC3 |
| 7609 | CIMI | CIMI | | | SCAC4 |
| 7610 | CIMK | CIRCLE M INC | | | SCAC3 |
| 7611 | CIMK | CIRCLE M INC | | | SCAC4 |
| 7612 | CIML | CHRISTOPHER, MILES & SON | | | SCAC3 |
| 7613 | CIML | CAMBRIDGE IRON & METAL CO INC | | | SCAC4 |
| 7614 | CIMM | CLITHERO MOVING & STORAGE | | | SCAC3 |
| 7615 | CIMM | CALIFORNIA IMMOBILIZER CORP | | | SCAC4 |
| 7616 | CIMP | CITY MOVING & STORAGE CO INC | | | SCAC3 |
| 7617 | CIMP | Cimpor - Cimentos de Portugal, SA | | PT | VKM |
| 7618 | CIMQ | CASS INTERNATIONAL MOVING INC | | | SCAC3 |
| 7619 | CIMR | CIMARRON COACH OF VIRGINIA INC | | | SCAC3 |
| 7620 | CIMR | CIMRAN TRANSPORT LIMITED | | | SCAC4 |
| 7621 | CIMS | CONTAINER INTERMODAL SERVICES LTD | | | SCAC3 |
| 7622 | CIMT | CAPITAL INTERMODAL TRANSPORTATION | | | SCAC4 |
| 7623 | CIMU | CIM LEASING LTD | | | SCAC3 |
| 7624 | CIMU | CONTAINER INVESTMENT MANUFACTURER A | | | SCAC4 |
| 7625 | CIMV | CITY MOVING SYSTEMS INC | | | SCAC3 |
| 7626 | CIMW | CIRCLE M CONSTRUCTION CO INC | | | SCAC3 |
| 7627 | CIMY | CHRISTIAN MOVING & STORAGE CO | | | SCAC3 |
| 7628 | CIN | Constellation International Airlines S.A. | IATA: CQ, Callsign: Constellation, Founded on 23 June 1995. Ceased operations on 03 December 1999. | B | AVCODES |
| 7629 | CIN | Saffron Aviation (Pvt) Ltd. d/b/a Cinnamon Air | IATA: C7, Callsign: Cinnamon, | CL | AVCODES |
| 7630 | CIN | CINKARNA CELJE D.D. | | SI | VKM |
| 7631 | CIND | The Central R.R. Co. of Indiana | added 4/1992; 1/1994-7/2005; eliminated 1/2008 | | NAKINA |
| 7632 | CIND | Consolidated Rail Corp. | 1/1980 | | NAKINA |
| 7633 | CIND | Central Indiana Ry. Co. | 1/1975 | | NAKINA |
| 7634 | CIND | Central Indiana Ry. Co. | Jan-75 | | NRHS |
| 7635 | CIND | Consolidated Rail Corp. | Jan-80 | | NRHS |
| 7636 | CIND | The Central R.R. Co. of Indiana | added 4/92; 1/94-7/2000 | | NRHS |
| 7637 | CIND | CENTRAL RAILROAD COMPANY OF INDIANA [CONRAIL; CENTRAL INDIANA RWY. CO.] | | | PWRC |
| 7638 | CIND | Central Railroad of Indiana | | | RSRV |
| 7639 | CIND | CENTRAL RAILROAD OF INDIANA | | | SCAC3 |
| 7640 | CIND | CENTRAL RAILROAD OF INDIANA | | | SCAC4 |
| 7641 | CINE | COASTLINE TRANSPORTATION CO | | | SCAC3 |
| 7642 | CINF | CONTINENTAL FREIGHTWAYS LIMITED | | | SCAC3 |
| 7643 | CINF | CRARY INDUSTRIES INC | | | SCAC4 |
| 7644 | CINH | CHE INC | | | SCAC4 |
| 7645 | CINI | CAIN LINE, THE | | | SCAC3 |
| 7646 | CINI | CALIN INC | | | SCAC4 |
| 7647 | CINJ | C & S | | | SCAC4 |
| 7648 | CINK | CLARK OIL INC | | | SCAC4 |
| 7649 | CINL | CENTRAL IND-ILL TRUCKING | | | SCAC3 |
| 7650 | CINL | CRUCES INTERNACIONALES MARTINEZ | | | SCAC4 |
| 7651 | CINM | CAIN, MARK TRUCKING | | | SCAC3 |
| 7652 | CINN | CINDERS INC | | | SCAC3 |
| 7653 | CINN | CINNIS TRUCKING | | | SCAC4 |
| 7654 | CINO | CITY TRANSPORTATION CO | | | SCAC3 |
| 7655 | CINQ | CINQUE TRUCKING COMPANY, INCORPORAT | | | SCAC3 |
| 7656 | CINQ | CRC INTERNATIONAL | | | SCAC4 |
| 7657 | CINR | Chicago & Indiana R.R. Co. | added 10/1979; 1/1980; eliminated 4/1980 | | NAKINA |
| 7658 | CINR | Chicago & Indiana R.R. Co. | 1/80; eliminated 4/80 | | NRHS |
| 7659 | CINR | CHICAGO & INDIANA RAILROAD CO. | | | PWRC |
| 7660 | CINS | COLLINS TRUCKING SERVICE | | | SCAC3 |
| 7661 | CINS | CARTANNA INTERNATIONAL SALES | | | SCAC4 |
| 7662 | CINT | CLARKE INTERNATIONAL | | | SCAC3 |
| 7663 | CINT | CARGILL INTERNATIONAL S A | | | SCAC4 |
| 7664 | CINU | CCIS FRANCE | | F | BIC |
| 7665 | CINU | CHAMBER INTERNATIONAL CHARTERS SRL. | | | SCAC3 |
| 7666 | CINU | COMBINALIA INTERMODAL SA | | | SCAC4 |
| 7667 | CINV | CONTAINER SERVICES INTERNATIONAL IN | | | SCAC3 |
| 7668 | CINV | CLARIAN INVESTMENTS | | | SCAC4 |
| 7669 | CINW | CARRIER NATIONWIDE INC | | | SCAC3 |
| 7670 | CINX | Carbonic Industries Corp. | added 7/1972; 1/1975; eliminated 10/1979; 1/1980 | | NAKINA |
| 7671 | CINX | Carbonic Industries Corp. | 1/75-1/80 | | NRHS |
| 7672 | CINX | CARBONIC INDUSTRIES CORP. | | | PWRC |
| 7673 | CINY | CLH INC | | | SCAC4 |
| 7674 | CIO | Il Ciocco International Travel Service Srl | Callsign: Ciocco, Name changed from Il Ciocco | I | AVCODES |
| 7675 | CIO | Il Ciocco | Callsign: Ciocco, Name changed to Il Ciocco International Travel Service Srl | I | AVCODES |
| 7676 | CIO | Il Ciocco International Travel Service | | | ICAO1 |
| 7677 | CIO | CLASSICS LIMOUSINE CO | | | SCAC4 |
| 7678 | CIOA | CAMION TRANSPORTATION INC | | | SCAC3 |
| 7679 | CIOB | COLONIAL TRANSPORT INC | | | SCAC3 |
| 7680 | CIOC | COLLINS OIL CO | | | SCAC3 |
| 7681 | CIOD | CITY OF DETROIT | | | SCAC3 |
| 7682 | CIOF | CITY OF CHARLOTTE | | | SCAC3 |
| 7683 | CIOH | CARETRAN INC | | | SCAC3 |
| 7684 | CIOI | CLASSIC COACH INC | | | SCAC3 |
| 7685 | CIOL | CONOCO INC | | | SCAC3 |
| 7686 | CIOM | CESARIO, M EXCAVATING AND TRUCKING | | | SCAC3 |
| 7687 | CION | CITY OF ROME TRANSIT DEPARTMENT | | | SCAC3 |
| 7688 | CIOP | CALICO TRANSPORT, INC. | | | SCAC3 |
| 7689 | CIOQ | CITY OF DURHAM | | | SCAC3 |
| 7690 | CIOR | CITY OF RALEIGH NC | | | SCAC3 |
| 7691 | CIOS | CAMIONEROS | | | SCAC3 |
| 7692 | CIOT | CONTAINER INNOVATIONS | | | SCAC3 |
| 7693 | CIOT | CONTAINER INNOVATIONS | | | SCAC4 |
| 7694 | CIOU | CENTRO INTERNAZIONALE STUDI CONTAINERS (C.I.S.CO.) | | I | BIC |
| 7695 | CIOV | CIOLFI VAN SERVICE INC | | | SCAC3 |
| 7696 | CIOW | CIMA ROAD TOWING | | | SCAC3 |
| 7697 | CIOW | CENTRAL IOWA LOGISTICS INC | | | SCAC4 |
| 7698 | CIOY | CION BAKERY | | | SCAC4 |
| 7699 | CIP | TAG City Air | Callsign: Cityways, ICAO code change to TEU | D | AVCODES |
| 7700 | CIP | City Air Germany AG | IATA: 6E, Callsign: Cityways, Ceased operations on 27 February 2004. | D | AVCODES |
