| 1001 | KCSX | *WHITE EAGLE OIL & REFINING CO. [KANSAS CITY STRUCTURAL STEEL CO.] | | | PWRC |
| 1002 | KCSX | *KASTEN RAIL CAR SERVICE | | | PWRC |
| 1003 | KCSZ | KANSAS CITY SOUTHERN RAILWAY COMPANY | | | PWRC |
| 1004 | KCSZ | Kansas City Southern Railway | | | RSRV |
| 1005 | KCSZ | KANSAS CITY SOUTHERN RAILWAY COMPAN | | | SCAC4 |
| 1006 | KCT | Kansas City Terminal Ry. Co. | 7/1923-1/1975; eliminated 1/1986; 1/1994; eliminated 1/1995 | | NAKINA |
| 1007 | KCT | Kansas City Terminal Ry. Co. | 4/38-1/75; eliminated 1/86; 1/94; eliminated 1/95 | | NRHS |
| 1008 | KCT | KANSAS CITY TERMINAL RWY. | | | PWRC |
| 1009 | KCT | Kansas City Terminal Railway | | | RSRV |
| 1010 | KCTA | K & C TRANSPORT INC | | | SCAC4 |
| 1011 | KCTC | KC TRANSPORT CO | | | SCAC3 |
| 1012 | KCTC | KING CITY CONTAINERS LTD | | | SCAC4 |
| 1013 | KCTF | K C TRANSFER INC | | | SCAC4 |
| 1014 | KCTG | KUBIE COBS & TRUCKING | | | SCAC3 |
| 1015 | KCTH | K C TRUCKING INC (DIV OF AMERICAN T | | | SCAC3 |
| 1016 | KCTI | KELLI-CHRISTOPHER TRUCKING INC | | | SCAC3 |
| 1017 | KCTI | KELLI-CHRISTOPHER TRUCKING INC | | | SCAC4 |
| 1018 | KCTK | K-C TRUCK-IN CORP | | | SCAC3 |
| 1019 | KCTK | KC TRUCKING | | | SCAC4 |
| 1020 | KCTL | Kansas City Transportation Co. LLC | added 4/2006; eliminated 10/2006; added 4/2008 | | NAKINA |
| 1021 | KCTL | KANSAS CITY TRANSPORTATION CO., LLC | | | PWRC |
| 1022 | KCTL | KANSAS CITY TRANSPORTATION CO LLC | | | SCAC4 |
| 1023 | KCTM | KOSKI & CHARETTE TRUCKING LTD | | | SCAC3 |
| 1024 | KCTM | K C T | | | SCAC4 |
| 1025 | KCTN | K C TRANSPORTATION | | | SCAC3 |
| 1026 | KCTN | K C TRANSPORT LLC | | | SCAC4 |
| 1027 | KCTP | KC TRANSPORT INC | | | SCAC4 |
| 1028 | KCTR | K-C TRANSPORTATION | | | SCAC3 |
| 1029 | KCTT | K C T TRANSPORTATION CO | | | SCAC3 |
| 1030 | KCTT | KCATT TRUCKING LTD | | | SCAC4 |
| 1031 | KCTU | KC TRADING BV | | NL | BIC |
| 1032 | KCTU | KC TRADING BV | | | SCAC4 |
| 1033 | KCTV | KCT Ry. Corp. | added 7/1990; eliminated 7/1992; 1/1994-7/2005 | | NAKINA |
| 1034 | KCTV | KCT Ry. Corp. | added 7/90; eliminated 7/92; 1/94-7/2000 | | NRHS |
| 1035 | KCTV | KCT RAILWAY CORPORATION | | | PWRC |
| 1036 | KCTV | KCT Railway | | | RSRV |
| 1037 | KCTV | KCT RAILWAY CORPORATION | | | SCAC3 |
| 1038 | KCTW | KING COAL TRAILWAYS | | | SCAC3 |
| 1039 | KCTZ | KCT ELEVATOR | | | PWRC |
| 1040 | KCU | Skyline Ulasim Ticaret A.S. | Callsign: Kocoglu, | TR | AVCODES |
| 1041 | KCUA | KRAUS CARPET USA | | | SCAC4 |
| 1042 | KCWB | Kansas City Westport Belt | 1/1975-1/1980 | | NAKINA |
| 1043 | KCWB | Kansas City Westport Belt | 1/75-1/80 | | NRHS |
| 1044 | KCWB | KANSAS CITY WESTPORT BELT | | | PWRC |
| 1045 | KCWB | Kansas City Westport Belt | | | RSRV |
| 1046 | KCWT | KILMER, C W TRUCKING | | | SCAC3 |
| 1047 | KCWW | KORAK CUSTOM WOODWORKING | | | SCAC4 |
| 1048 | KCWX | Kimberly-Clark of Canada Ltd. | added 7/1977; 1/1980; eliminated 1/1994; 1/1994-7/2005 (not listed) | | NAKINA |
| 1049 | KCWX | Kimberly-Clark of Canada Ltd. | added 7/77; 1/80; eliminated 1/94; 7/2000 | | NRHS |
| 1050 | KCWX | KIMBERLY-CLARK OF CANADA LTD | | | PWRC |
| 1051 | KCWX | Kimberly-Clark of Canada | | | RSRV |
| 1052 | KCX | Kingsford Co. | added 10/1957; 10/1957-4/1961; eliminated 1/1962 | | NAKINA |
| 1053 | KCX | Kingan & Co. | 1/1943-4/1947 | | NAKINA |
| 1054 | KCX | Kingsford Chemical Co. | 7/1954; eliminated 10/1957 | | NAKINA |
| 1055 | KCX | Kingsford Chemical Co. | eliminated 10/57 | | NRHS |
| 1056 | KCX | Kingsford Co. | added 10/57; 10/57-4/61; eliminated 1/62 | | NRHS |
| 1057 | KCX | *KINGAN & CO. | | | PWRC |
| 1058 | KCX | *KINGSFORD CO. [KINGSFORD CHEMICAL CO.] | | | PWRC |
| 1059 | KCXE | KC EXPRESS | | | SCAC4 |
| 1060 | KCXI | KANSAS CONTINENTAL EXPRESS INC | | | SCAC3 |
| 1061 | KCXI | KANSAS CONTINENTAL EXPRESS INC | | | SCAC4 |
| 1062 | KCZT | K C Z TRANSPORT LTD | | | SCAC3 |
| 1063 | KD | Kendell Airlines | ICAO: KDA, Callsign: Kendell, IATA Prefix: 678, Ceased operations | AUS | AVCODES |
| 1064 | KD | British Island Airways Ltd. (BIA) | ICAO: BIA, Callsign: British Island, Ceased operations on 01 February 1990. | GB | AVCODES |
| 1065 | KD | Air Entreprise | ICAO: AEN, Callsign: Enterprise, Designator KD recalled by IATA | F | AVCODES |
| 1066 | KD | Abal Air | Callsign: Abalair, | S | AVCODES |
| 1067 | KD | British Island Airways Ltd. (BIA) | ICAO: BIS, Callsign: Britisland, | GB | AVCODES |
| 1068 | KD | Kaliningradavia Open Joint Sotck Company | ICAO: KNI, Callsign: Kaliningrad Air, Name changed to KD Avia Open Joint Stock Company | RUS | AVCODES |
| 1069 | KD | KD Avia Open Joint Stock Company | ICAO: KNI, IATA Prefix: 093, Ceased Operations. Name changed from Kaliningradavia Open Joint Sotck Company | RUS | AVCODES |
| 1070 | KD | Kal Star Aviation, PT. | ICAO: KLS, Callsign: Kalstar, Ceased operations on 30 November 2017. | RI | AVCODES |
| 1071 | KD | Western Global Airlines, LLC | ICAO: WGN, Callsign: Western Global, Name changed to Western Global Airlines, Inc. Received Part 121 AOC on 04 August 2014. Affiliated to Finnish carrier, Nordic Globa Air. | USA | AVCODES |
| 1072 | KD | Western Global Airlines, Inc. | ICAO: WGN, Callsign: Western Global, Name changed from Western Global Airlines, LLC. Received Part 121 AOC on 04 August 2014. Affiliated to Finnish carrier, Nordic Globa Air. | USA | AVCODES |
| 1073 | KD | Koleje Dolnośląskie Spółka Akcyjna | | PL | VKM |
| 1074 | KDA | Kendell Airlines | IATA: KD, Callsign: Kendell, IATA Prefix: 678, Ceased operations | AUS | AVCODES |
| 1075 | KDA | Keuk Dong Dae | Callsign: Keuk Dong Dae, | ROK | AVCODES |
| 1076 | KDA | Kendell Airlines | | | ICAO1 |
| 1077 | KDA | Kendell Airlines | | AUS | TRAFFIC |
| 1078 | KDAC | K-DAC ENTERPRISES INC | | | SCAC4 |
| 1079 | KDAG | KING-DANFORTH AGENCY | | | SCAC3 |
| 1080 | KDAI | KINDA IMPORT-EXPORT | | | SCAC4 |
| 1081 | KDAK | KODIAK OILFIELD HAULERS INC | | | SCAC3 |
| 1082 | KDAT | KENDALL TRUCKING | | | SCAC3 |
| 1083 | KDAV | KING DAVID MOVERS INC | | | SCAC3 |
| 1084 | KDAV | KUKER, DAVE TRUCKING | | | SCAC4 |
| 1085 | KDBC | K D B SERVICES | | | SCAC4 |
| 1086 | KDBL | KUSLER, DAVE BUSES LTD | | | SCAC3 |
| 1087 | KDBT | KENNEY, D B TRANSPORT INC | | | SCAC4 |
| 1088 | KDC | K.D. Air Corporation | IATA: XC, Callsign: Key Dee, Ceased operaitons. | CDN | AVCODES |
| 1089 | KDC | K D Air Corporation | | | ICAO1 |
| 1090 | KDCF | KALE, D C FARMS & TRUCKING | | | SCAC3 |
| 1091 | KDCF | K & D TRANSPORT OF MARSEILLES INC | | | SCAC4 |
| 1092 | KDCO | KRASH DELIVERY CO | | | SCAC3 |
| 1093 | KDCR | KDC FARMS | | | SCAC4 |
| 1094 | KDCS | KANIS, DIRK CONTRACTING LTD | | | SCAC4 |
| 1095 | KDCU | KUKDONG MARITIME EQUIPMENT SERVICE | | ROK | BIC |
| 1096 | KDCU | FAR EAST CONTAINER CO LTD | | | SCAC4 |
| 1097 | KDCX | Eastman Chemical Co., Inc. | added 1/2004; 7/2005 | | NAKINA |
| 1098 | KDCX | Eastman Chemical Canada, Inc. | added 1/1995; 7/2000; eliminated 1/2004 | | NAKINA |
| 1099 | KDCX | Kodak Canada, Inc. | added 10/1990; 1/1994; eliminated 1/1995 | | NAKINA |
| 1100 | KDCX | Kodak Canada, Inc. | added 10/90; 1/94; eliminated 1/95 | | NRHS |
