| 1 | CHR | Air Charter Services (ACS) | Callsign: Zaire Charter, | ZRE | AVCODES |
| 2 | CHR | Christler Flying Service, Inc. | Callsign: Christler, | USA | AVCODES |
| 3 | CHR | SC Aviation, Inc. | Callsign: Cheese Maker, ICAO designator changed to COL. ICAO callsign changed to Colony. | USA | AVCODES |
| 4 | CHR | Chairman Airmotive II, LLC | Callsign: Chairman, | USA | AVCODES |
| 5 | CHR | Air Charter Services | | | ICAO1 |
| 6 | CHR | Chestnut Ridge Ry. Co. | 1/1975-1/1980; eliminated 4/1981; 1/1994-7/2005 | | NAKINA |
| 7 | CHR | Chestnut Ridge Ry. Co. | 1/75-1/80; eliminated 4/81; 1/94-7/2000 | | NRHS |
| 8 | CHR | CHESTNUT RIDGE RAILWAY CO. | | | PWRC |
| 9 | CHR | Chestnut Ridge Railway | | | RSRV |
| 10 | CHR | CHESTNUT RIDGE RAILWAY COMPANY | | | SCAC4 |
| 11 | CHR | Cement Hranice, akciová společnost | | CZ | VKM |
| 12 | CHRA | CHARLES TRANSFER INC | | | SCAC3 |
| 13 | CHRB | CHARLES TRANSFER | | | SCAC3 |
| 14 | CHRB | CHORBE FARM | | | SCAC4 |
| 15 | CHRC | Chaparral R.R. Co., Inc. | added 7/1990; 1/1994; eliminated 7/1994; 7/2000-7/2005 | | NAKINA |
| 16 | CHRC | Chaparral R.R. Co., Inc. | added 7/90; 1/94; eliminated 7/94; 7/2000 | | NRHS |
| 17 | CHRC | CHAPARRAL RAILROAD COMPANY, INC. | | | PWRC |
| 18 | CHRC | Chaparral Railroad | | | RSRV |
| 19 | CHRC | CHAPARRAL RAILROAD COMPANY INC | | | SCAC3 |
| 20 | CHRC | CHAPARRAL RAILROAD COMPANY INC | | | SCAC4 |
| 21 | CHRD | CHARLOTTE VAN AND STORAGE CO, INC | | | SCAC3 |
| 22 | CHRE | CHEROKEE INDUSTRIES | | | SCAC3 |
| 23 | CHRF | CHURCHILL FREIGHT SERVICES INC | | | SCAC4 |
| 24 | CHRG | CHARLTON TRANSPORT(QUEBEC) LTD | | | SCAC3 |
| 25 | CHRG | CHAMPLIN, ROGER D | | | SCAC4 |
| 26 | CHRH | CHURCH TRUCKING COMPANY INC | | | SCAC3 |
| 27 | CHRI | CHEMTRANS INC | | | SCAC3 |
| 28 | CHRI | CHRISTAL TRANSPORT | | | SCAC4 |
| 29 | CHRJ | CHARBONNEAU, R & SONS INC | | | SCAC3 |
| 30 | CHRK | CHRISTENSEN, R J TRUCKING | | | SCAC3 |
| 31 | CHRL | CHURNS TRUCK LINES INC | | | SCAC3 |
| 32 | CHRL | CHAVEZ OROZCO, MIRNA ALICIA | | | SCAC4 |
| 33 | CHRN | CHEMICAL RAINBOW TANK LINES | | | SCAC3 |
| 34 | CHRN | CHA-RP RENTAL CENTER INC | | | SCAC4 |
| 35 | CHRO | CHIEFTAIN TRUCKING | | | SCAC3 |
| 36 | CHRO | CHROMALLOY SOUTHWEST | | | SCAC4 |
| 37 | CHRP | CHRISTOPHERSON TRUCKING | | | SCAC3 |
| 38 | CHRQ | CHARTER INTERNATIONAL OIL CO | | | SCAC3 |
| 39 | CHRR | Chesapeake R.R. Co. | 7/2000-7/2005 | | NAKINA |
| 40 | CHRR | Chesapeake R.R. Co. | Jul-00 | | NRHS |
| 41 | CHRR | CHESAPEAKE RAILROAD CO. | | | PWRC |
| 42 | CHRR | Chesapeake Railroad | | | RSRV |
| 43 | CHRR | CHESAPEAKE RAILROAD COMPANY | | | SCAC4 |
| 44 | CHRS | CHRISTY TRUCKING COMPANY | | | SCAC3 |
| 45 | CHRS | CHRISTY TRUCKING COMPANY | | | SCAC4 |
| 46 | CHRT | CHRISTONI, J. R | | | SCAC3 |
| 47 | CHRT | CHRISTONI J R | | | SCAC4 |
| 48 | CHRU | CHEMOURS COMPANY FC LLC | | USA | BIC |
| 49 | CHRU | Chemours Fc | | | RSRV |
| 50 | CHRU | CHARGEURS REUNIS | | | SCAC3 |
| 51 | CHRU | CHARGEURS REUNIS | | | SCAC4 |
| 52 | CHRV | CHAMBERS TRANSPORTATION SERVICES IN | | | SCAC4 |
| 53 | CHRW | CHARAPATA TRUCKING INC | | | SCAC3 |
| 54 | CHRX | The Chesapeake Division | 1/1994-7/2005 (not listed) | | NAKINA |
| 55 | CHRX | Canadian Hidrogas Resources Ltd. | added 7/1969; 4/1970-1/1980; eliminated 1/1983 | | NAKINA |
| 56 | CHRX | Canadian Hidrogas Resources Ltd. | added 7/69; 4/70-1/80; eliminated 1/83 | | NRHS |
| 57 | CHRX | The Chesapeake Division | 1/94-7/2000 | | NRHS |
| 58 | CHRX | *CANADIAN HIDROGAS RESOURCES, LTD. | | | PWRC |
| 59 | CHRX | *CHESAPEAKE RAILROAD CO. | | | PWRC |
| 60 | CHRX | *CHEVRON OIL & REFINING CO. | | | PWRC |
| 61 | CHRX | +THE CHESAPEAKE DIV., RAILROAD ENTHUSIASTS, INC. | | | PWRC |
| 62 | CHRX | The Chesapeake Division | | | RSRV |
| 63 | CHRX | THE CHESAPEAKE DIV., RAILROAD ENTHU | | | SCAC4 |
| 64 | CHRY | CHEMICAL RESOURCE CORP | | | SCAC3 |
