This is a list of all airline codes . The table lists the IATA airline designators, the ICAO airline designators and the airline call signs (telephony designator). Historical assignments are also included for completeness.
| IATA | ICAO | Airline | Call sign | Country | Comments |
|---|---|---|---|---|---|
| KSA | K S Avia | SKY CAMEL | Latvia | ||
| KCR | Kolob Canyons Air Services | KOLOB | United States | ||
| KW | KHK | Kharkiv Airlines | SUNRAY | Ukraine | |
| KGZ | Kyrgyz Airlines | BERMET | Kyrgyzstan | ||
| KDC | K D Air Corporation | KAY DEE | Canada | ||
| KMI | K-Mile Air | KAY-MILE AIR | Thailand | ||
| KD | KLS | Kalstar Aviation | KALSTAR | Indonesia | |
| KD | KNI | KD Avia | KALININGRAD AIR | Russia | |
| WA | KLC | KLM Cityhopper | CITY | Netherlands | |
| KLH | KLM Helicopter | KLM HELI | Netherlands | ||
| KL | KLM | KLM | KLM | Netherlands | |
| N2 | QNK | Kabo Air | KABO | Nigeria | |
| KMC | Kahama Mining Corporation | KAHAMA | Tanzania | ||
| KI | KAI | KaiserAir | KAISER | United States | Operates B737-500, B737-700, B737-800 |
| K4 | CKS | Kalitta Air | CONNIE | United States | Operates B747-400's, B767-300ER's, B777F |
| K9 | KFS | Kalitta Charters | KALITTA | United States | Operates Lear 25s, 35s, 36s Falcon 20s, CL601 |
| CB* | KII | Kalitta Charters II | DRAGSTER | United States | Operates B727-200's, DC9-15 & 30, B737-400's |
| KES | Kallat El Saker Air Company | KALLAT EL SKER | Libya | ||
| RQ | KMF | Kam Air | KAMGAR | Afghanistan | |
| E2 | KMP | Kampuchea Airlines | KAMPUCHEA | Cambodia | IATA was KT |
| KIZ | Kanaf-Arkia Airlines | Israel | |||
| KHE | Kanfey Ha'emek Aviation | KANFEY HAEMEK | Israel | ||
| KSU | Kansas State University | K-STATE | United States | ||
| V2 | AKT | Karat | AVIAKARAT | Russia | |
| KRB | Karibu Airways Company | KARIBU AIR | Tanzania | ||
| KLG | Karlog Air Charter | KARLOG | Denmark | defunct | |
| KAJ | Karthago Airlines | KARTHAGO | Tunisia | ||
| KAE | Kartika Airlines | KARTIKA | Indonesia | ||
| KTV | Kata Transportation | KATAVIA | Sudan | ||
| KTK | Katekavia | KATEKAVIA | Russia | ||
| KAT | Kato Airline | KATO-AIR | Norway | ||
| KV | MVD | Kavminvodyavia | AIR MINVODY | Russia | |
| XKA | Kavouras Inc | United States | |||
| KRN | Kaz Agros Avia | ANTOL | Kazakhstan | ||
| KAW | Kaz Air West | KAZWEST | Kazakhstan | ||
| KAO | Kazan Aviation Production Association | KAZAVAIA | Russia | ||
| KPH | Kazan Helicopters | KAMA | Russia | ||
| KKA | Kazavia | KAKAIR | Kazakhstan | ||
| KZS | Kazaviaspas | SPAKAZ | Kazakhstan | ||
| 3Q | KCH | KC International Airlines | CAM AIR | Cambodia | |
| JFK | Keenair Charter - | KEENAIR | United Kingdom | ||
| KLX | Kelix Air | KELIX | Nigeria | ||
| FKL | Kelner Airways | KELNER | Canada | ||
| KW | KFA | Kelowna Flightcraft Air Charter | FLIGHTCRAFT | Canada | |
| KDA | Kendell Airlines | KENDELL | Australia | defunct | |
| M5 | KEN | Kenmore Air | KENMORE | United States | |
| KBA | Kenn Borek Air | BOREK AIR | Canada | ||
| KAH | Kent Aviation | DEKAIR | Canada | ||
| KQ | KQA | Kenya Airways | KENYA | Kenya | |
| KVS | Kevis | KEVIS | Kazakhstan | ||
| ZN | KEY | Key Airlines | KEY AIR | United States | |
| KG | LYM | Key Lime Air | KEY LIME | United States | |
| FTP | Keystone Aerial Surveys | FOOTPRINT | United States | ||
| BZ | KEE | Keystone Air Service | KEYSTONE | Canada | |
| K6 | KZW | Khalifa Airways | KHALIFA AIR | Algeria | |
| WKH | Kharkov Aircraft Manufacturing Company | WEST-KHARKOV | Ukraine | ||
| KHR | Khazar | KHAZAR | Turkmenistan | ||
| KHP | Khoezestan Photros Air Lines | PHOTROS AIR | Iran | ||
| KRV | Khoriv-Avia | KHORIV-AVIA | Ukraine | ||
| X9 KO | KHO | Khors Aircompany | AIRCOMPANY KHORS | Ukraine | defunct |
| KHY | Khyber Afghan Airlines | KHYBER | Afghanistan | ||
| UAK | Kiev Aviation Plant | AVIATION PLANT | Ukraine | ||
| KNG | King Aviation | KING | United Kingdom | ||
| BEZ | Kingfisher Air Services | SEA BREEZE | United States | ||
| IT | KFR | Kingfisher Airlines | KINGFISHER | India | Defunct Since 2012 |
| 4I | KNX | Knighthawk Air Express | KNIGHT FLIGHT | Canada | |
| KAS | Kingston Air Services | KINGSTON AIR | Canada | ||
| KIP | Kinnarps | KINNARPS | Sweden | ||
| KNS | Kinshasa Airways | KINSHASA AIRWAYS | Democratic Republic of the Congo | defunct | |
| KTA | Kirov Air Enterprise | VYATKA-AVIA | Russia | ||
| Y9 | IRK | Kish Air | KISHAIR | Iran | |
| KR | KHA | Kitty Hawk Aircargo | AIR KITTYHAWK | United States | defunct |
| 2K | KHC | Kitty Hawk Airways | CARGO HAWK | United States | defunct |
| KP | KIA | Kiwi International Air Lines | KIWI AIR | United States | |
| KRA | Kiwi Regional Airlines | REGIONAL | New Zealand | ||
| KY | KNA | Kunming Airlines | KUNMING AIR | China | ICAO code KNA was used by Knight Air |
| KHX | Knighthawk Express | RIZZ | United States | ||
| KGT | Knights Airlines | KNIGHT-LINER | Nigeria | ||
| KOA | Koanda Avacion | KOANDA | Spain | ||
| OYE | Koda International | KODA AIR | Nigeria | ||
| 7K | KGL | Kogalymavia Air Company | KOGALYM | Russia | |
| KOM | Kom Activity | COMJET | Netherlands | ||
| KMA | Komiaviatrans State Air Enterprise | KOMI AVIA | Russia | ||
| 8J | KMV | Komiinteravia | KOMIINTER | Russia | |
| KNM | Komsomolsk-on-Amur Air Enterprise | KNAAPO | Russia | ||
| KOB | Koob-Corp - 96 KFT | AUTOFLEX | Hungary | ||
| KE | KAL | Korean Air | KOREANAIR | South Korea | |
| KMG | Kosmas Air | KOSMAS CARGO | Serbia | ||
| KSM | Kosmos | KOSMOS | Russia | ||
| KOS | Kosova Airlines | KOSOVA | Serbia | ||
| WOK | Kovar Air | WOKAIR | Czech Republic | ||
| 7B | KJC | Krasnojarsky Airlines | KRASNOJARSKY AIR | Russia | defunct |
| KFC | Kremenchuk Flight College | KREMENCHUK | Ukraine | ||
| KRG | Krimaviamontag | AVIAMONTAG | Ukraine | ||
| KRO | Kroonk Air Agency | KROONK | Ukraine | ||
| K9 | KRI | Krylo Airlines | Krylo | Russia | |
| KYM | Krym | CRIMEA AIR | Ukraine | ||
| OPC | Krystel Air Charter | OPTIC | United Kingdom | ||
| GW | KIL | Kuban Airlines | AIR KUBAN | Russia | |
| VD | KPA | Kunpeng Airlines | KUNPENG | China | |
| KZA | Kurzemes Avio | Russia | |||
| KBV | Kustbevakningen | SWECOAST | Sweden | ||
| KU | KAC | Kuwait Airways | KUWAITI | Kuwait | |
| GO | KZU | Kuzu Airlines Cargo | KUZU CARGO | Turkey | |
| QVR | Kvadro Aero | PEGASO | Kyrgyzstan | ||
| KWN | Kwena Air | KWENA | South Africa | ||
| N5 | KGZ | Kyrgyz Airlines | BERMET | Kyrgyzstan | |
| KTC | Kyrgyz Trans Avia | DINARA | Kyrgyzstan | ||
| QH | LYN | Kyrgyzstan | ALTYN AVIA | Kyrgyzstan | Name changed to Air Kyrgyzstan |
| R8 | KGA | Kyrgyzstan Airlines | KYRGYZ | Kyrgyzstan | |
| DAM | Kyrgyzstan Department of Aviation | FLIGHT RESCUE | Kyrgyzstan | under the Ministry of Emergency Situation | |
| KGB | Kyrgz General Aviation | KEMIN | Kyrgyzstan | ||
| FK | KEW | Keewatin Air | BLIZZARD | Canada | |
| JS | KOR | Air Koryo | AIR KORYO | North Korea |