| 1 | CK | China Cargo Airlines Ltd. | ICAO: CKK, Callsign: China King, IATA Prefix: 112, IATA designator changed from 2J* / ICAO designator changed from CHY, Callsign changed from Cargo China | PRC | AVCODES |
| 2 | CK | Connair PTY Ltd. | | AUS | AVCODES |
| 3 | CK | Aircapitol | Callsign: Aircap, | I | AVCODES |
| 4 | CK&S | Chicago, Kalamazoo & Saginaw Ry. | 4/1938 | | NAKINA |
| 5 | CK&S | Chicago, Kalamazoo & Saginaw Ry. | Apr-38 | | NRHS |
| 6 | CK&S | CHICAGO, KALAMAZOO & SAGINAW RWY. | | | PWRC |
| 7 | CKA | Cook Inlet Aviation, Inc. | Callsign: Cook-Air, | USA | AVCODES |
| 8 | CKA | Cook Inlet Aviation | | | ICAO1 |
| 9 | CKAA | COKER, A AND COMPANY LTD | | | SCAC3 |
| 10 | CKAB | CK AND B INC | | | SCAC4 |
| 11 | CKAD | C & K TRUCKING WHEELERSBURG OHIO | | | SCAC4 |
| 12 | CKAF | COKER AIR FREIGHT INC | | | SCAC3 |
| 13 | CKAH | CALIFORNIAS TRUCKLINE TRANSPORT | | | SCAC4 |
| 14 | CKAJ | COUNTRY KIDS TRUCKING LLC | | | SCAC4 |
| 15 | CKAL | CHECK AIR CARGO LTD | | | SCAC3 |
| 16 | CKAN | CLARK TRANSPORTATION SERVICE INC | | | SCAC3 |
| 17 | CKAO | CIRCLE K TRANSPORTATION LLC | | | SCAC4 |
| 18 | CKAR | CASANOVA NAZARIO, KARINA | | | SCAC4 |
| 19 | CKAS | CLARK & SNIVELY TRUCKING LIMITED | | | SCAC3 |
| 20 | CKAT | CINKAT TRANSPORTATION INC | | | SCAC3 |
| 21 | CKAU | COOL CARRIERS | | | SCAC3 |
| 22 | CKAV | COMET TRUCKING INC | | | SCAC4 |
| 23 | CKAW | CHICKASAW CHARTER | | | SCAC3 |
| 24 | CKBB | C K B BROKERS INC | | | SCAC3 |
| 25 | CKBB | C K B BROKERS INC | | | SCAC4 |
| 26 | CKBC | COAKLEY BROS CO | | | SCAC3 |
| 27 | CKBC | COAKLEY BROS CO | | | SCAC4 |
| 28 | CKBD | CHECKERBOARD VANS | | | SCAC3 |
| 29 | CKBE | CLARK, B L EXPRESS INC | | | SCAC3 |
| 30 | CKBE | CUSTOM MARKETING CO LLC | | | SCAC4 |
| 31 | CKBG | CONDOCK BEFRACHTUNGS-GESELLSCHAFT M | | | SCAC3 |
| 32 | CKBG | CONDOCK BEFRACHTUNGS-GMBH & CO KG | | | SCAC4 |
| 33 | CKBH | CALIFORNIA KITCHENS & BATHS | | | SCAC4 |
| 34 | CKBI | CLARK BROTHERS INC | | | SCAC3 |
| 35 | CKBK | CHEROKEE CARGO CORPORATION | | | SCAC4 |
| 36 | CKBL | COCKBURN RANCH LTD | | | SCAC4 |
| 37 | CKBN | CEKUTA, BEN | | | SCAC4 |
| 38 | CKBQ | CASTLE ROCK TRANSPORTATION INC | | | SCAC4 |
| 39 | CKBR | CLEAR LAKE TRUCK BROKERS INC | | | SCAC3 |
| 40 | CKBR | CUKAJ TRANSPORT INC | | | SCAC4 |
| 41 | CKBS | COOK BROTHERS INC | | | SCAC3 |
| 42 | CKBT | CREEK, B S AUTO TRANSPORT | | | SCAC4 |
| 43 | CKBX | Cruikshank Brothers Co. | 7/1935-1/1943 | | NAKINA |
| 44 | CKBX | Cruikshank Brothers Co. | Apr-38 | | NRHS |
| 45 | CKBX | CRUIKSHANK BROTHERS CO. | | | PWRC |
| 46 | CKC | CKC Services, Inc. | | USA | AVCODES |
| 47 | CKC | CKC Services | | | ICAO1 |
| 48 | CKCA | COOK CARTAGE | | | SCAC3 |
| 49 | CKCB | CURRY, KEN CONSTRUCTION INC | | | SCAC4 |
| 50 | CKCC | COOK, CLYDE C | | | SCAC3 |
| 51 | CKCD | COOK, C D | | | SCAC3 |
| 52 | CKCE | COOKSON CARRIERS CORPORATION | | | SCAC3 |
| 53 | CKCF | CHICAGO KANSAS CITY FREIGHT LINES | | | PWRC |
| 54 | CKCF | CHARNOCK, CHARLES F AND SON | | | SCAC3 |
| 55 | CKCF | CKC FREIGHT LINE LLC | | | SCAC4 |
| 56 | CKCG | CLARK CARTAGE CO INC | | | SCAC3 |
| 57 | CKCG | COOK LOGISTICS LLC | | | SCAC4 |
| 58 | CKCH | COAKLEY, C H & CO INC | | | SCAC3 |
| 59 | CKCI | CLARK, C R TRUCKMEN INC | | | SCAC3 |
| 60 | CKCJ | COLLINS TRUCKING COMPANY INC | | | SCAC4 |
| 61 | CKCK | CLARK, CHAS TRUCKING | | | SCAC3 |
| 62 | CKCL | CLARK, CLEVELAND JR | | | SCAC3 |
| 63 | CKCM | COOKS CARRIERS INC | | | SCAC3 |
| 64 | CKCN | C K C INC | | | SCAC3 |
| 65 | CKCN | CKC SERVICES INC | | | SCAC4 |
| 66 | CKCO | C.K. MARITIME | | | SCAC3 |
| 67 | CKCP | CLARKE CORP | | | SCAC3 |
| 68 | CKCQ | CROCKER, CHRISTOPHER SCOTT | | | SCAC4 |
| 69 | CKCR | COOKS CRATING INC | | | SCAC3 |
| 70 | CKCR | CK COURIER | | | SCAC4 |
| 71 | CKCU | SOLSINO LTD | | HK | BIC |
| 72 | CKCV | CHEROKEE COURIER SERVICES INC | | | SCAC3 |
| 73 | CKCW | CHUCKS CARTAGE | | | SCAC3 |
| 74 | CKCY | COOK COUNTY SCHOOL BUS INC | | | SCAC3 |
| 75 | CKCY | CONCEPT TANKER CORPORATION | | | SCAC4 |
| 76 | CKD | CKD Praha | | CZ | TRAFFIC |
| 77 | CKD | Chemle Kelhelm GmbH | | DE | VKM |
| 78 | CKDA | CLC TRUCKING | | | SCAC4 |
| 79 | CKDC | COMERCIALIZADORA E IMPORTADORA DUCK | | | SCAC4 |
| 80 | CKDG | CREEKSIDE TRANSPORTATION SERVICES I | | | SCAC4 |
| 81 | CKDL | CLARK, DENNIS L INC | | | SCAC3 |
| 82 | CKDN | CIA MAKEDONIA DE NAVEGACION S A | | | SCAC3 |
| 83 | CKDN | CHRIS IRRIGATION INC | | | SCAC4 |
| 84 | CKDO | CLARK, DYSON | | | SCAC4 |
| 85 | CKDQ | CLARK, DARRELL | | | SCAC4 |
| 86 | CKDR | CHEROKEE DISTRIBUTION SERVICES INC | | | SCAC3 |
| 87 | CKDR | CHEROKEE DISTRIBUTION SERVICES INC | | | SCAC4 |
| 88 | CKDS | CHUCKS DELIVERY SERVICE | | | SCAC3 |
| 89 | CKDT | CROSS CREEK TRADING CO | | | SCAC4 |
| 90 | CKDV | CLARK, DAVID L | | | SCAC3 |
| 91 | CKDV | CLASSIC LIVESTOCK HAULING LTD | | | SCAC4 |
| 92 | CKDW | CLARK, DONALD W INC | | | SCAC3 |
| 93 | CKDY | CLARK, DYSON INC | | | SCAC3 |
| 94 | CKE | Corporate Aviation Services, Inc. | Callsign: Checkmate, | USA | AVCODES |
| 95 | CKE | Corporate Aviation Services | | | ICAO1 |
| 96 | CKEB | CROCKETT BROS INC | | | SCAC3 |
| 97 | CKEC | COOKES CRATING INC | | | SCAC3 |
| 98 | CKEE | CROSS CREEK TRANSPORTATION INC | | | SCAC4 |
| 99 | CKEG | CHESAPEAKE GRAIN CO INC | | | SCAC4 |
| 100 | CKEH | CHEROKEE EXPRESS INC | | | SCAC3 |
