| 1 | KM | Air Malta p.l.c. | ICAO: AMC, Callsign: Air Malta, IATA Prefix: 643, Name changed to Air Malta Co. Ltd. ICAO callsign changed to Kilo Mike | M | AVCODES |
| 2 | KM | Air Malta co. Ltd. | ICAO: AMC, Callsign: Kilo Mike, IATA Prefix: 643, Name changed to Air Malta p.l.c. ICAO callsign changed to Air Malta | M | AVCODES |
| 3 | KM | Kansas and Missouri Ry. and Terminal Co. | 1/1994-7/2005 | | NAKINA |
| 4 | KM | The Kansas City Southern Ry. Co. | added 10/1984 | | NAKINA |
| 5 | KM | The Kansas and Missouri Ry. and Terminal Co. | 1/1975-1/1980; eliminated 10/1984 | | NAKINA |
| 6 | KM | The Kansas and Missouri Ry. and Terminal Co. | 1/75-1/80; eliminated 10/84 | | NRHS |
| 7 | KM | The Kansas City Southern Ry. Co. | added 10/84 | | NRHS |
| 8 | KM | Kansas and Missouri Ry. and Terminal Co. | 1/94-7/2000 | | NRHS |
| 9 | KM | KANSAS CITY SOUTHERN RAILWAY [KANSAS & MISSOURI RY. & TERMINAL CO.] | | | PWRC |
| 10 | KM | Kansas and Missouri Railway and Terminal | | | RSRV |
| 11 | KM | Koleje Mazowieckie | | PL | TRAFFIC |
| 12 | KMA | Komiaviatrans State Air Enterprise | Callsign: Komi Avia, Name changed to Komiaviatrans Open Joint sotck Company | RUS | AVCODES |
| 13 | KMA | Komiaviatrans Open Joint Stock Company | IATA: KO, Callsign: Komi Avia, Name changed from Komiaviatrans State Air Enterprise | RUS | AVCODES |
| 14 | KMA | Komiaviatrans State Air Enterprise | | | ICAO1 |
| 15 | KMAA | KMA TRANSPORTATION LLC | | | SCAC4 |
| 16 | KMAC | KMAC TRANSPORT | | | SCAC4 |
| 17 | KMAE | KEMNA ENTERPRISES | | | SCAC3 |
| 18 | KMAE | KEMNA ENTERPRISES | | | SCAC4 |
| 19 | KMAF | K & M AIR FREIGHT | | | SCAC3 |
| 20 | KMAF | KMT ENTERPRISES | | | SCAC4 |
| 21 | KMAK | KETELSEN, MARK | | | SCAC4 |
| 22 | KMAL | KMA LLC | | | SCAC4 |
| 23 | KMAN | KUNTZMAN, R | | | SCAC3 |
| 24 | KMAN | KUNTZMAN TRUCKING INC | | | SCAC4 |
| 25 | KMAR | Royal Military Constabulary (Koninklijke Marechaussee) | | NL | TRAFFIC |
| 26 | KMAS | KELLER MOVING & STORAGE, INC | | | SCAC3 |
| 27 | KMAS | KERO-DEL OF MARYLAND INC | | | SCAC4 |
| 28 | KMAT | KMA TRANSPORTATION CO | | | SCAC3 |
| 29 | KMAU | ROYAL NETHERLANDS NAVY | | NL | BIC |
| 30 | KMAU | TRANSMO SPECIAL PRODUCTS BV | | | SCAC4 |
| 31 | KMB | Deltaq Engineering Aviation Limited | Callsign: Kemblejet, | GB | AVCODES |
| 32 | KMB | Delta Engineering Aviation | | | ICAO1 |
| 33 | KMB | Kowloon Motor Bus Company | | HK | TRAFFIC |
| 34 | KMBE | KAMBER ENTERPRISES | | | SCAC3 |
| 35 | KMBG | KIMBROUGH, MAX TRANSPORTS INC | | | SCAC3 |
| 36 | KMBH | KMB TRANSPORT LTD | | | SCAC3 |
| 37 | KMBI | KAMBRI EXPRESS INC | | | SCAC3 |
| 38 | KMBK | K & M BARK AND SAWDUST INC | | | SCAC3 |
| 39 | KMBM | KMB TRANSPORT | | | SCAC4 |
| 40 | KMBN | KMB TRUCKING INC | | | SCAC4 |
| 41 | KMBO | KIM BROTHERS TRANSPORTATION | | | SCAC3 |
| 42 | KMBR | KIMBERLIN, CARL | | | SCAC3 |
| 43 | KMBR | KIMBRELL FARMS | | | SCAC4 |
| 44 | KMBS | KONICA MINOLTA BUSINESS SOLUTIONS U | | | SCAC4 |
| 45 | KMBT | KIMBER, THOMAS | | | SCAC3 |
| 46 | KMBU | KAMBARA KISEN CO LTD | | J | BIC |
| 47 | KMBU | KAMBARA KISE | | | SCAC4 |
| 48 | KMBX | Keilman Brothers | 10/1957 (not listed) | | NAKINA |
| 49 | KMBX | Keilman Brothers | Oct-57 | | NRHS |
| 50 | KMBX | KEILMAN BROTHERS | | | PWRC |
| 51 | KMC | Kahama Mining Corporation | Callsign: Kahama, | EAT | AVCODES |
| 52 | KMC | Kahama Mining Corporation | | | ICAO1 |
| 53 | KMCD | KMC TRADING | | | SCAC3 |
| 54 | KMCI | KODIAK MOTOR CARRIER INC | | | SCAC3 |
| 55 | KMCM | K M CONSTRUCTION | | | SCAC4 |
| 56 | KMCO | KEMCO TRUCKING, INC | | | SCAC3 |
| 57 | KMCP | K M C TRANSPORTATION INC | | | SCAC4 |
| 58 | KMCT | KMC TRANSPORT INC | | | SCAC3 |
| 59 | KMCT | K, MICHAEL TRUCKING | | | SCAC4 |
| 60 | KMCU | KMARIN OCEAN LOGISTICS (KOL) | | ROK | BIC |
| 61 | KMCU | MITSUI O.S.K. LINES, LTD | | | PWRC |
| 62 | KMCU | Mitsui O.S.K. Lines | | | RSRV |
| 63 | KMCU | KENNECOTT GREENS CREEK MINING CO | | | SCAC4 |
| 64 | KMCW | KEOJE MARINE CO LTD | | | SCAC4 |
| 65 | KMCX | Kerr-McGee Coal Corp. | added 1/1995; eliminated 7/1998; 7/2000-7/2005 (not listed) | | NAKINA |
| 66 | KMCX | Kerr-McGee Chemical Corp. | reporting marks changed from APMX 1/1971; eliminated 11/1973; added 11/1977; 1/1980; eliminated 4/1993; added 10/1993; 1/1994; eliminated 1/1995 | | NAKINA |
| 67 | KMCX | Knappen Milling Co. | added 7/1964; 7/1965-10/1966; eliminated 7/1968 | | NAKINA |
| 68 | KMCX | Knappen Milling Co. | added 7/64; 7/65-10/66; eliminated 7/68 | | NRHS |
| 69 | KMCX | Kerr-McGee Chemical Corp. | reporting marks changed from APMX 1/71; eliminated 11/73; 1/80; eliminated 4/93; added 10/93; 1/94; eliminated 1/95 | | NRHS |
| 70 | KMCX | Kerr-McGee Coal Corp. | added 1/95; eliminated 7/98; 7/2000 | | NRHS |
| 71 | KMCX | *KNAPPEN MILLING CO. | | | PWRC |
| 72 | KMCX | +KERR-MCGEE COAL CORPORATION | | | PWRC |
| 73 | KMCX | Kerr-Mcgee Coal Corporation | | | RSRV |
| 74 | KMCX | KNAPPEN MILLING CO | | | SCAC3 |
| 75 | KMCZ | KELLERMEYER COMPANY | | | PWRC |
| 76 | KMD | Kutnohorská místní dráha o.s. | | CZ | VKM |
| 77 | KMDI | K M D INC | | | SCAC3 |
| 78 | KMDI | KINGSWOOD MILLWORK & DESIGN INC | | | SCAC4 |
| 79 | KMDM | KMD MARINE INC | | | SCAC3 |
| 80 | KMDM | KMD MARINE INC | | | SCAC4 |
| 81 | KMDQ | KAMDEN INTERNATIONAL SHIPPING INC. | | | SCAC3 |
| 82 | KMDS | KAPITAN MANFRED DRAXL SCHIFFAHRTS G | | | SCAC4 |
| 83 | KMDT | K & M DISTRIBUTION INC | | | SCAC4 |
| 84 | KMDW | KBT TRANSPORT LLC | | | SCAC4 |
| 85 | KME | Cambodia Airways Co., Ltd. | IATA: KR, Callsign: Giant Ibis, Commence operations on 10 July 2018. | K | AVCODES |
| 86 | KME | KANSAS MISSOURI ELEVATOR | | | PWRC |
| 87 | KMED | K & M EXPEDITING INC | | | SCAC4 |
| 88 | KMEI | KOUROS MARITIME ENTERPRISES INC | | | SCAC4 |
| 89 | KMEP | KM EXPRESS | | | SCAC4 |
| 90 | KMER | KIMMEL, ERVIN H | | | SCAC3 |
| 91 | KMES | KRONEMAN EXPRESS INC | | | SCAC4 |
| 92 | KMET | KINGSTON MARITIME ENTERPRISES (UK) | | | SCAC3 |
| 93 | KMEU | K LINE | | | PWRC |
| 94 | KMEU | K Line | | | RSRV |
| 95 | KMEU | K LINE (KAWASAKI KISEN KAISHA LTD) | | | SCAC3 |
| 96 | KMEU | K LINE (KAWASAKI KISEN KAISHA LTD) | | | SCAC4 |
| 97 | KMEX | KOCH METHANOL LLC | | | SCAC4 |
| 98 | KMEZ | KERR MCGEE CHEMICAL CORP. | | | PWRC |
| 99 | KMF | Kam Air | IATA: RQ, Callsign: Kamgar, IATA Prefix: 384, | AFG | AVCODES |
| 100 | KMF | Kam Air | IATA: RQ | | ICAO1 |
