| 6601 | CHIX | *CHICAGO TANK CAR CO. | | | PWRC |
| 6602 | CHIX | *CONSOLIDATED HOLDINGS CO. INC. | | | PWRC |
| 6603 | CHIZ | CHAHALIS INDUSTRY | | | PWRC |
| 6604 | CHJ | Aircompany Chaika | Callsign: Air Chaika, Name changed to Eurocharter Airlines | UA | AVCODES |
| 6605 | CHJ | Eurocharter Airlines | Callsign: Air Chaika, Name changed from Aircompany Chaika | UA | AVCODES |
| 6606 | CHJ | Star Jet Co., Ltd. | Callsign: Shining, | PRC | AVCODES |
| 6607 | CHJ | Aircompany Chaika | | | ICAO1 |
| 6608 | CHJ | Kristianstad - Hässleholm Järnvägar | 1863 - 1944 | S | svenska-lok.se |
| 6609 | CHJ | Kristianstad - Hässleholm Järnvägar | 1863 - 1944 | S | TRAFFIC |
| 6610 | CHJA | CHASE AIR FREIGHT | | | SCAC3 |
| 6611 | CHJA | CORTES HERNANDEZ, JAIME | | | SCAC4 |
| 6612 | CHJB | CHILD LOGISTICS INC | | | SCAC4 |
| 6613 | CHJD | CAHILL SEEDS | | | SCAC4 |
| 6614 | CHJE | CHICKOS ENERGY SERVICES LLC | | | SCAC4 |
| 6615 | CHJF | CHUCKY TRANSPORT INC | | | SCAC4 |
| 6616 | CHJG | CCC HAULING INC | | | SCAC4 |
| 6617 | CHJH | CHANICE, JOHN TRANSPORTATION INC | | | SCAC4 |
| 6618 | CHJJ | CHARBONNEAU, WALTER | | | SCAC4 |
| 6619 | CHJK | CHRISTENSEN, JACK | | | SCAC3 |
| 6620 | CHJM | CHRISTIE TRUCKING INC | | | SCAC4 |
| 6621 | CHJN | COASTAL HELICOPTERS INC | | | SCAC4 |
| 6622 | CHJO | CHARNOTA, JOHN JR | | | SCAC3 |
| 6623 | CHJR | CHURCH, JOSEPH R TRUCKING INC | | | SCAC4 |
| 6624 | CHJS | CHRISTIANE SHIPPING LIMITED | | | SCAC3 |
| 6625 | CHJS | CHRISTIANE SHIPPING LIMITED | | | SCAC4 |
| 6626 | CHJT | C & H TRANSPORT LLC | | | SCAC4 |
| 6627 | CHJV | CHOHAN, JEEVAN TRANSPORT LTD | | | SCAC4 |
| 6628 | CHJY | CHUCHRO, JACENTY | | | SCAC3 |
| 6629 | CHJY | CHUCHRO, JACENTY | | | SCAC4 |
| 6630 | CHK | Flying Boat Inc. d/b/a Chalk's International Airines | IATA: OP, Callsign: Chalks, IATA Prefix: 370, | USA | AVCODES |
| 6631 | CHK | Flying Boat Inc. d/b/a Chalks International Airlines | IATA: OP, IATA Prefix: 370, | USA | AVCODES |
| 6632 | CHK | Chalk's International Airlines | Callsign: Chalks, | USA | AVCODES |
| 6633 | CHKA | CHOHAN TRUCKING | | | SCAC4 |
| 6634 | CHKB | CHRISTIANSEN TRUCKING CO | | | SCAC3 |
| 6635 | CHKD | CHEEK DWIGHT TRUCKING | | | SCAC3 |
| 6636 | CHKE | CHEROKEE TRANSPORT INC | | | SCAC3 |
| 6637 | CHKE | CHK TRANSPORT INC | | | SCAC4 |
| 6638 | CHKF | COUCH TRUCKING COMPANY LLC | | | SCAC4 |
| 6639 | CHKG | CHUCKS GENERAL TRUCKING | | | SCAC3 |
| 6640 | CHKG | CHEMCORE TRUCKING COMPANY INC | | | SCAC4 |
| 6641 | CHKH | C & H TRUCKING | | | SCAC3 |
| 6642 | CHKH | CHARLES TRUCKING LLC | | | SCAC4 |
| 6643 | CHKI | COCHIOLO TRUCKING INC | | | SCAC4 |
| 6644 | CHKJ | CHALE TRUCKING | | | SCAC4 |
| 6645 | CHKK | CHUCKS TRUCKING | | | SCAC3 |
| 6646 | CHKL | CHEROKEE LINES INC | | | SCAC3 |
| 6647 | CHKM | CHEROKEE MILLING COMPANY INC | | | SCAC3 |
| 6648 | CHKM | CHARTER LINK LOGISTICS LIMITED | | | SCAC4 |
| 6649 | CHKP | CHECOS TRUCKING | | | SCAC4 |
| 6650 | CHKQ | CHEROKEE TRUCK | | | SCAC3 |
| 6651 | CHKQ | CHARLES TRUCKING | | | SCAC4 |
| 6652 | CHKS | CHUCKS TRANSPORT INC | | | SCAC4 |
| 6653 | CHKT | CORNHUSKER TRUCKING COMPANY INC | | | SCAC3 |
| 6654 | CHKT | CHUCKS TRANSPORT | | | SCAC4 |
| 6655 | CHKU | CHUNG HWA CHEMICAL INDUSTRIAL WORKS | | | SCAC4 |
| 6656 | CHKV | CHECKER MOVING & STORAGE INC | | | SCAC3 |
| 6657 | CHKW | CHICKENHAW | | | SCAC4 |
| 6658 | CHKY | CHRISTIAN TRUCKING LLC | | | SCAC4 |
| 6659 | CHL | Cohlmia Aviation | Callsign: Cohlmia, | USA | AVCODES |
| 6660 | CHL | Cranfield Helicopters Ltd. | | GB | AVCODES |
| 6661 | CHL | Cohlmia Aviation | | | ICAO1 |
| 6662 | CHL | C & H BUS LINES INC | | | SCAC4 |
| 6663 | CHLA | CHARRON TRANSPORT LIMITED | | | SCAC3 |
| 6664 | CHLA | CHARRON TRANSPORT LIMITED | | | SCAC4 |
| 6665 | CHLB | CHALLY BROS TRUCK SERVICE | | | SCAC3 |
| 6666 | CHLC | CHEM-LINK CO, | | | SCAC3 |
| 6667 | CHLC | CHELL TRUCKING | | | SCAC4 |
| 6668 | CHLD | CHL TRUCKING | | | SCAC3 |
| 6669 | CHLE | CHARLEVOIX EXPRESS INC | | | SCAC3 |
| 6670 | CHLE | CHARLEVOIX EXPRESS INC | | | SCAC4 |
| 6671 | CHLF | CHL TRANSPORTING & HAULING CO | | | SCAC4 |
| 6672 | CHLG | CHALLENGE TRANSPORT INC | | | SCAC3 |
| 6673 | CHLG | CHILDS TRUCKIN | | | SCAC4 |
| 6674 | CHLH | CHESTERTON LIMOUSINE SERVICE | | | SCAC3 |
| 6675 | CHLH | CHASE TRANSPORTATION & LOGISTICS LL | | | SCAC4 |
| 6676 | CHLI | CHAMPION LABORATORIES INC | | | SCAC4 |
| 6677 | CHLJ | CHANCELLOR, LARRY JOE | | | SCAC3 |
| 6678 | CHLJ | CHI LOGISTICS LLC | | | SCAC4 |
| 6679 | CHLL | CHALLENGER TRANSPORTATION INC | | | SCAC4 |
| 6680 | CHLM | CHISHOLM TRANSPORTATION COMPANY | | | SCAC3 |
| 6681 | CHLM | CHISHOLM TRUCKING LLC | | | SCAC4 |
| 6682 | CHLN | CHELAN TRANSFER COMPANY, INC | | | SCAC3 |
| 6683 | CHLN | CHELAN TRANSFER COMPANY INC | | | SCAC4 |
| 6684 | CHLO | CHAMPLAIN OIL COMPANY INC | | | SCAC4 |
| 6685 | CHLQ | CAROLINA HAULERS INC | | | SCAC3 |
| 6686 | CHLR | CHEM LAB PRODUCTS INC | | | SCAC3 |
| 6687 | CHLR | CHATEAU LINGERIE MFG INC | | | SCAC4 |
| 6688 | CHLS | CHAMPAGNE LIMOUSINES | | | SCAC3 |
| 6689 | CHLT | CHALLENGE AIR INTERNATIONAL INC. | | | SCAC3 |
| 6690 | CHLU | MARGUISA SHIPPING LINES | | E | BIC |
| 6691 | CHLU | CONSORTIUM HISPANA LINES SA | | | SCAC4 |
| 6692 | CHLV | CHRISTIE-LAMBERT VAN & STORAGE CO I | | | SCAC3 |
| 6693 | CHLW | CRAIG'S HAULING LLC | | | SCAC4 |
| 6694 | CHLX | Chemleco, Inc. | added 7/1981; 1/1994-7/2000; eliminated 4/2001; 7/2005 (not listed) | | NAKINA |
| 6695 | CHLX | Cutler-Hammer Inc. | added 7/1958; 4/1961-4/1970; eliminated 7/1972 | | NAKINA |
| 6696 | CHLX | Cutler-Hammer Inc. | added 7/58; 4/61-4/70 | | NRHS |
| 6697 | CHLX | Chemleco, Inc. | added 7/81; 1/94-7/2000; eliminated 4/2001 | | NRHS |
| 6698 | CHLX | *CUTLER-HAMMER INC. | | | PWRC |
| 6699 | CHLX | *COMO-HARRIET STREETCAR LINE | | | PWRC |
| 6700 | CHLX | +CHEMLECO, INC. | | | PWRC |
