| 2001 | KGNX | General American Transportation Corp. | 4/1970; eliminated 1/1972 | | NAKINA |
| 2002 | KGNX | Hygrade Food Products Corp. (General American Transportation Corp.) | 10/1966 | | NAKINA |
| 2003 | KGNX | General American Transportation Corp. | 1/1952-7/1965 | | NAKINA |
| 2004 | KGNX | General American Transportation Corp. | 1/52-7/65 | | NRHS |
| 2005 | KGNX | Hygrade Food Products Corp. (General American Transportation Corp.) | Oct-66 | | NRHS |
| 2006 | KGNX | General American Transportation Corp. | 4/70; eliminated 1/72 | | NRHS |
| 2007 | KGNX | *HYGRADE FOOD PRODUCTS CORP. (GENERAL AMERICAN TRANSPORTATION CORP.) | | | PWRC |
| 2008 | KGNX | *(GATC) KINGAN INC. | | | PWRC |
| 2009 | KGO | Korongo Airlines sprl | IATA: ZC, Callsign: Korongo, IATA Prefix: 557, Ceased operations on 04 September 2015. Founded 15 December 2009. Operations commenced 16 April 2012. | ZRE | AVCODES |
| 2010 | KGOC | KING OCEAN LINES | | | PWRC |
| 2011 | KGOL | KARGO LLC | | | SCAC4 |
| 2012 | KGOP | KINGSTON OIL SUPPLY CORP | | | SCAC4 |
| 2013 | KGOS | KEN-GO SERVICES, INC | | | SCAC3 |
| 2014 | KGR | Kirgizian Railways (KГР) | | KG | VKM |
| 2015 | KGRB | KISH, GORDON B | | | SCAC4 |
| 2016 | KGRE | KING RANCH ENTERPRISE TRUCKING | | | SCAC3 |
| 2017 | KGRE | KG REEDEREI ROTH GMBH & CO | | | SCAC4 |
| 2018 | KGRN | KENTON GRAIN | | | SCAC4 |
| 2019 | KGRP | KING TRANSPORTATION | | | SCAC4 |
| 2020 | KGRQ | KINGS READY MIX INC | | | SCAC3 |
| 2021 | KGRS | KANGAROO SERVICES INC | | | SCAC3 |
| 2022 | KGRS | KGR TRANSPORTATION LTD | | | SCAC4 |
| 2023 | KGRT | KOKESCH TRUCKING INC | | | SCAC3 |
| 2024 | KGRT | KRUEGER TRUCKING INC | | | SCAC4 |
| 2025 | KGRX | Kasgro Rail Corp. | added 10/1996; 7/2000-7/2005 | | NAKINA |
| 2026 | KGRX | Kasgro Rail Corp. | added 10/96; 7/2000 | | NRHS |
| 2027 | KGRX | KASGRO RAIL CORPORATION | | | PWRC |
| 2028 | KGRX | Kasgro Rail Corporation | | | RSRV |
| 2029 | KGS | KAP.kg Aircompany LLC | IATA: AB, Callsign: Berkut, | KS | AVCODES |
| 2030 | KGSA | KINGSGATE TRANSPORTATION SALES | | | SCAC3 |
| 2031 | KGSA | KINGSGATE TRANSPORTATION SALES | | | SCAC4 |
| 2032 | KGSE | KINGSEY TRANSPORT (1991) LTEE | | | SCAC3 |
| 2033 | KGSK | K G S TRUCKING | | | SCAC4 |
| 2034 | KGSL | KG SUNLINE SHIPPING | | | SCAC3 |
| 2035 | KGSL | K G INDUSTRIES LTD | | | SCAC4 |
| 2036 | KGSP | KGS TRANSPORT | | | SCAC3 |
| 2037 | KGSP | KGS TRANSPORT | | | SCAC4 |
| 2038 | KGSQ | KINGS EXPRESS | | | SCAC3 |
| 2039 | KGST | KINGSTON TRANSFER CO, INC | | | SCAC3 |
| 2040 | KGST | KILGORE, S & J TRUCKING | | | SCAC4 |
| 2041 | KGSU | KGS KELLER GERATE & SERVICE GMBH | | D | BIC |
| 2042 | KGSW | KINGSWAY TRANSPORTATION SERVICES | | | SCAC3 |
| 2043 | KGSW | KINGSWAY TRANSPORTATION SERVICES | | | SCAC4 |
| 2044 | KGT | Knights Airlines Ltd | Callsign: Knight-Liner, | WAN | AVCODES |
| 2045 | KGT | Knights Airlines | | | ICAO1 |
| 2046 | KGT | KGT Gleis- und Tiefbau GmbH | | DE | VKM |
| 2047 | KGTA | K & G TRANSPORT | | | SCAC3 |
| 2048 | KGTB | KINGS TRANSPORT INC | | | SCAC3 |
| 2049 | KGTC | KNIGHT TRANSPORTATION COMPANY INC | | | SCAC3 |
| 2050 | KGTD | KEHR, G TRUCKING CO | | | SCAC3 |
| 2051 | KGTE | KING TRANSPORT INC | | | SCAC4 |
| 2052 | KGTF | KINGSCO TRANSPORT LTD | | | SCAC4 |
| 2053 | KGTG | KING TRUCKING INC | | | SCAC3 |
| 2054 | KGTG | KING TUT LOGISTICS LLC | | | SCAC4 |
| 2055 | KGTH | KINGSRIDGE TRUCKING CORP | | | SCAC3 |
| 2056 | KGTI | KING TRUCKING INC | | | SCAC3 |
| 2057 | KGTI | KING TRUCKING INC | | | SCAC4 |
| 2058 | KGTJ | K & G TRUCKING | | | SCAC4 |
| 2059 | KGTK | KNIGHT TRUCKING | | | SCAC3 |
| 2060 | KGTL | KING TRUCKING INC OF LIBERTY SC | | | SCAC3 |
| 2061 | KGTM | KINGDOM TRANSPORATION COMPANY | | | SCAC4 |
| 2062 | KGTN | K G TRANSPORT | | | SCAC3 |
| 2063 | KGTO | KINGS TRANSFER | | | SCAC3 |
| 2064 | KGTO | KINGS TRANSFER INC | | | SCAC4 |
| 2065 | KGTP | KING TRANSPORTATION CO | | | SCAC3 |
| 2066 | KGTP | K G TRANSPORT INC | | | SCAC4 |
| 2067 | KGTR | KNIGHT TRUCKING | | | SCAC3 |
| 2068 | KGTV | KING TREE SERVICE | | | SCAC4 |
| 2069 | KGTY | K G T TRUCKING INC | | | SCAC4 |
| 2070 | KGWB | KETCHIKAN GATEWAY BOROUGH | | | SCAC3 |
| 2071 | KGWE | KING WELL EXPRESS INC | | | SCAC4 |
| 2072 | KGWH | KING WHOLESALER INC | | | SCAC4 |
| 2073 | KGWK | KINGWOOD TRUCKING CO INC | | | SCAC3 |
| 2074 | KGWM | KING, WILLIAM D | | | SCAC4 |
| 2075 | KGWN | KINGSWOOD, RON INC | | | SCAC4 |
| 2076 | KGWO | KOGER-WALTERS OIL CO | | | SCAC4 |
| 2077 | KGWQ | KGW LOGISTICS (M) SDN BHD | | | SCAC4 |
| 2078 | KGWR | KING SR, WILL OTIS TRUCKING | | | SCAC4 |
| 2079 | KGWS | KING OF WINDOWS LTD | | | SCAC4 |
| 2080 | KGXP | KING EXPEDITING INC | | | SCAC4 |
| 2081 | KGXT | KRUGEX TRANSPORT CORPORATION | | | SCAC3 |
| 2082 | KGY | Kyrghyzstan Airlines | IATA: K2, Callsign: Kyrair, IATA Prefix: 758, ICAO designator changed from KGA | KS | AVCODES |
| 2083 | KGZ | Kyrgyz Airlines | Callsign: Bermet, Ceased operations. | KS | AVCODES |
| 2084 | KGZ | Kyrgyz Airlines | IATA: N5 | | ICAO1 |
| 2085 | KH | Heli-shuttle BVBA | Designator KH recalled by IATA | B | AVCODES |
| 2086 | KH | Horizon Airlines Pty Ltd. | ICAO: HZA, Callsign: Horiz Air, IATA designator changed from YK* / Designator HK* recalled by IATA | AUS | AVCODES |
| 2087 | KH | Cook Island Airways | | NZ | AVCODES |
| 2088 | KH | Cook Islands Airways Ltd. | ICAO: KHH, Callsign: Kilo Hotel, | COK | AVCODES |
| 2089 | KH | Kyrgyz Airways Limited | Designator KH recalled by IATA | KS | AVCODES |
| 2090 | KH | Aeko Kula, Inc d/b/a Aloha Air Cargo | ICAO: AAH, Callsign: Aloha, IATA Prefix: 687, | USA | AVCODES |
| 2091 | KHA | Kitty Hawk Aircargo, Inc. | {`IATA: KR, Callsign: Air Kittyhawwk, IATA Prefix: 798, Founded in 1976 as Kitty Hawk Airways). Commenced operations in 1985. Ceased operations in 2008. Name changed from Kitty Hawk Air Cargo, Inc.`};SRCKEY=AVCODES | USA | |
| 2092 | KHA | Kitty Hawk Air Cargo, Inc. | IATA: KR, Callsign: Air Kittyhawwk, IATA Prefix: 798, Name changed to Kitty Hawk Aircargo, Inc. | USA | AVCODES |
| 2093 | KHA | Kitty Hawk Airways d/b/a 135 Airways, Inc. | IATA: 2K, Name changed to Kitty Hawk Air Cargo, Inc. | USA | AVCODES |
| 2094 | KHA | Kitty Hawk Aircargo | | | ICAO1 |
| 2095 | KHAL | KHALIS TRANSPORT INC | | | SCAC4 |
| 2096 | KHAN | KHAN, FAROUK | | | SCAC4 |
| 2097 | KHAR | Kharkov Transport | | UA | TRAFFIC |
| 2098 | KHAY | KUHN HAY | | | SCAC3 |
| 2099 | KHAY | KUHN HAY INC | | | SCAC4 |
| 2100 | KHB | Khabarovsk Aviation Group | IATA: H8, Callsign: Khabarovsk Air, Name changed to Dalavia - Far East Airways - Khabarovsk | RUS | AVCODES |
