| 201 | KAJI | KAJI, HUGO TRUCKING | | | SCAC3 |
| 202 | KAJK | KELLER, A J TRUCKING | | | SCAC4 |
| 203 | KAJT | K AND J TRUCKING, INC | | | SCAC3 |
| 204 | KAJT | KITCHEN, A JR TRUCKING AND | | | SCAC4 |
| 205 | KAK | Aviatrack | Callsign: Aviatrack, | KZ | AVCODES |
| 206 | KAKA | KAMEN KARGO | | | SCAC3 |
| 207 | KAKC | KA TRUCKING INC | | | SCAC4 |
| 208 | KAKD | K AND K MENDEZ TRUCKING INC | | | SCAC4 |
| 209 | KAKG | K & A TRUCKING INC OF CHICAGO | | | SCAC4 |
| 210 | KAKI | KIMES AND KIMES | | | SCAC3 |
| 211 | KAKI | KIMES AND KIMES | | | SCAC4 |
| 212 | KAKM | K & K EXPRESS INC | | | SCAC3 |
| 213 | KAKO | K & K OIL CO | | | SCAC4 |
| 214 | KAKP | K AND K TRANSPORTATION | | | SCAC4 |
| 215 | KAKQ | KLINE & KLINE STORAGE COMPANY INC | | | SCAC3 |
| 216 | KAKQ | KLINE & KLINE STORAGE COMPANY INC | | | SCAC4 |
| 217 | KAKT | K & K TRANSPORTATION CORP | | | SCAC3 |
| 218 | KAL | Korean Air Lines Co. Ltd. | IATA: KE, Callsign: Koreanair, IATA Prefix: 180, Name changed to Korean Air w.e.f. 20 June 1984. | ROK | AVCODES |
| 219 | KAL | Korean Air | IATA: KE, Callsign: Koreanair, IATA Prefix: 180, Name changed from Korean Air Lines Co. Ltd. w.e.f. 20 June 1984. | ROK | AVCODES |
| 220 | KAL | Korean Air | IATA: KE | | ICAO1 |
| 221 | KAL | Korean Air | | ROK | TRAFFIC |
| 222 | KALA | KALUZA, JOE & SON | | | SCAC3 |
| 223 | KALA | Kaliskie Linie Autobusowe | Real: KLA, City: Kalisz | PL | TRAFFIC |
| 224 | KALB | KALB, LORAS | | | SCAC3 |
| 225 | KALB | K AND L BROKERAGE INC | | | SCAC4 |
| 226 | KALC | KEEPER, ALEX | | | SCAC4 |
| 227 | KALD | K & L TRANSPORT INC | | | SCAC3 |
| 228 | KALD | K & L INTERNATIONAL TRADING INC | | | SCAC4 |
| 229 | KALE | KALE TRANSPORT | | | SCAC4 |
| 230 | KALF | KALFUR BROS | | | SCAC3 |
| 231 | KALF | KANGRA AIR LOGISTICS PVT LTD | | | SCAC4 |
| 232 | KALF | Kisalföld Volán | | H | TRAFFIC |
| 233 | KALG | K & L GRAIN INC | | | SCAC3 |
| 234 | KALH | KTL TRANSPORT INC | | | SCAC4 |
| 235 | KALI | | City: Kaliningrad | SU | TRAFFIC |
| 236 | KALI | K+S KALI GmbH | | DE | VKM |
| 237 | KALJ | KALJEN LOGISTICS INC | | | SCAC4 |
| 238 | KALK | KALKASKA CONSTRUCTION SERVICE INC | | | SCAC3 |
| 239 | KALK | KINGFISHER AIRLINES LTD | | | SCAC4 |
| 240 | KALN | KA LOGISTICS INC | | | SCAC4 |
| 241 | KALO | K A R LOGISTICS | | | SCAC4 |
| 242 | KALP | KERSH, A L TRUCKING | | | SCAC3 |
| 243 | KALQ | KALAMOS SHIPPING CORPORATION | | | SCAC3 |
| 244 | KALQ | KAL TIRE | | | SCAC4 |
| 245 | KALR | KAL-TIRE | | | SCAC4 |
| 246 | KALS | KALS EXPRESS CO INC | | | SCAC4 |
| 247 | KALT | KALITTA CHARTERS | | | SCAC4 |
| 248 | KALU | NKG KALA HAMBURG GMBH | | D | BIC |
| 249 | KALV | KALVONNA LOGISTICS | | | SCAC4 |
| 250 | KALV | Kalvacha Gas / Кълвача Газ | | BG | VKM |
| 251 | KALVN | Kalvacha Energia / Кълвача Енергия | | BG | VKM |
| 252 | KALX | Knadler & Lucas (General American Tank Car Corp.) | 8/1920-7/1923 | | NAKINA |
| 253 | KALX | KNADLER & LUCAS (GENERAL AMERICAN TANK CAR CORP.) | | | PWRC |
| 254 | KALY | KALYN INC | | | SCAC3 |
| 255 | KAM | Air Mach | Callsign: Ico-Air, | I | AVCODES |
| 256 | KAM | TOO Sunkar Air | IATA: S3, Callsign: Sunkar, | KZ | AVCODES |
| 257 | KAM | Air Mach | | | ICAO1 |
| 258 | KAMA | KAMM INDUSTRIES INC | | | SCAC4 |
| 259 | KAMAZ | Kamaz | | SU | TRAFFIC |
| 260 | KAMC | KAMAC TRUCKING INC | | | SCAC3 |
| 261 | KAMC | KAMCO SEAFOODS INC | | | SCAC4 |
| 262 | KAME | KAM MESSENGER SERVICE | | | SCAC3 |
| 263 | KAME | KING ARCHITECTURAL METALS | | | SCAC4 |
| 264 | KAMF | KANSAS MOTOR FREIGHT, INC | | | SCAC3 |
| 265 | KAMF | KANSAS MOTOR FREIGHT INC | | | SCAC4 |
| 266 | KAMI | KAMPSCHMIDT FARMS | | | SCAC3 |
| 267 | KAMI | | Closed on 2006/11/30 | J | TRAFFIC |
| 268 | KAMJ | KAMJAA TRUCKING INC | | | SCAC3 |
| 269 | KAMK | K A M TRUCKING INC | | | SCAC4 |
| 270 | KAML | KAMAL TRUCKING CORPORATION | | | SCAC4 |
| 271 | KAMM | KAVANAU | | | SCAC4 |
| 272 | KAMM | Kämmerer / Ahlstrom Papier Osnabrück | | D | TRAFFIC |
| 273 | KAMN | KATSCHMAN, MICHAEL DALE | | | SCAC3 |
| 274 | KAMN | KEYSTONE AGRI-MOTIVE (2005) INC | | | SCAC4 |
| 275 | KAMO | KSA AMERICA | | | SCAC4 |
| 276 | KAMQ | KAMBER, NICK TRUCKING | | | SCAC3 |
| 277 | KAMR | KAM RIDGE MFG | | | SCAC4 |
| 278 | KAMS | KATO MOVING & STORAGE INC | | | SCAC3 |
| 279 | KAMS | KATO MOVING & STORAGE INC | | | SCAC4 |
| 280 | KAMU | CHAMAE | | | SCAC4 |
| 281 | KAMW | KAM-WAY TRANSPORTATION INC | | | SCAC4 |
| 282 | KAMX | Kamen, Inc. | added 4/1985; 1/1994-7/2005 | | NAKINA |
| 283 | KAMX | Kelloggs & Miller, Inc. | 7/1930-7/1932 | | NAKINA |
| 284 | KAMX | Bisbee Linseed Co. | 7/1937 | | NAKINA |
| 285 | KAMX | Kelloggs & Miller | 7/1923 | | NAKINA |
| 286 | KAMX | Kamen, Inc. | added 4/85; 1/94-7/2000 | | NRHS |
| 287 | KAMX | *KELLOGGS & MILLER, INC. | | | PWRC |
| 288 | KAMX | *BISBEE LINSEED CO. | | | PWRC |
| 289 | KAMX | +KAMEN, INC. | | | PWRC |
| 290 | KAMX | Kamen | | | RSRV |
| 291 | KAMX | KAMEN, INC. | | | SCAC4 |
| 292 | KAMZ | KOCH ASPHALT MATERIALS | | | PWRC |
| 293 | KAN | Ak-Kanat | Callsign: Kanat, | KZ | AVCODES |
| 294 | KAN | Kansas Highway Patrol | Callsign: Kansas Patrol, ICAO callsign changed to Kansas | USA | AVCODES |
| 295 | KAN | Kansas Highway Patrol | Callsign: Kansas, ICAO callsign changed from Kansas Patrol | USA | AVCODES |
| 296 | KAN | Kanto Railway Co., Ltd. | Kanto- Tetsudo- Kabushiki-gaisha | J | TRAFFIC |
| 297 | KANACHU | Kanagawa Chuo Kotsu | | J | TRAFFIC |
| 298 | KANAW | Kanto Auto Works Ltd (KANTOU JIDOUSYA Co, Ltd) | | J | TRAFFIC |
| 299 | KANB | KANE BROS, CO, THE | | | SCAC3 |
| 300 | KANB | Kanbara Railway | | J | TRAFFIC |
