| 4201 | KOYM | KOOYMAN, PETE TRUCKING COMPANY | | | SCAC3 |
| 4202 | KOYO | KOYOTE TRUCKING | | | SCAC4 |
| 4203 | KOYO | KOYO ROMANIA S.A. | | RO | VKM |
| 4204 | KOYU | KOYUNCU TICARET A.S. | | TR | BIC |
| 4205 | KOZ | Angel Airlines, S.A. | IATA: 8K, Callsign: Angel Wings, IATA Prefix: 650, Founded in August 2001. Declared bankruptcy and ceased operations in 2004. Designator 8K recalled by IATA | RO | AVCODES |
| 4206 | KOZT | KOLASZEWSKI TRUCKING INC | | | SCAC3 |
| 4207 | KOZT | KOZIE, MURRAY TRUCKING LTD | | | SCAC4 |
| 4208 | KOZY | KOZY MOVING & STORAGE | | | SCAC3 |
| 4209 | KP | Kiwi International Air Lines | ICAO: KIA, Callsign: Kiwi Air, IATA Prefix: 538, Ceased operations | USA | AVCODES |
| 4210 | KP | Air Cape | ICAO: ACP, Callsign: Cape, Designator KP recalled by IATA | ZA | AVCODES |
| 4211 | KP | ASKY | ICAO: SKK, Callsign: Asky Airline, IATA Prefix: 032, | TG | AVCODES |
| 4212 | KP | PT. Asialink Cargo Express | ICAO: AKC, Callsign: Asialink Cargo, IATA Prefix: 385, | RI | AVCODES |
| 4213 | KP | Kombinovani prevoz d.o.o., Novi Beograd | | RS | VKM |
| 4214 | KPA | Kun Peng Airlines Co. Ltd | Callsign: Kun Peng, | PRC | AVCODES |
| 4215 | KPA | Kunpeng Airlines | IATA: VD | | ICAO1 |
| 4216 | KPAC | K-PAC LOGISTIC SERVICES | | | SCAC4 |
| 4217 | KPAG | KEN PAGE TRANSFER | | | SCAC3 |
| 4218 | KPAP | KYZER PLANTS & PRODUCE INC | | | SCAC4 |
| 4219 | KPAT | KP AUTO TRANSPORT | | | SCAC4 |
| 4220 | KPBC | KEIPER, B & C INC | | | SCAC3 |
| 4221 | KPBL | KPB LANDBRIDGE LLC | | | SCAC4 |
| 4222 | KPBQ | KAPITAN BABIEVSKIY SHIPPING CO LTD, | | | SCAC3 |
| 4223 | KPBQ | KW TRANSPORTATION SERVICES | | | SCAC4 |
| 4224 | KPBS | KNAPPS BUS LINES | | | SCAC3 |
| 4225 | KPBS | K-WAY EXPRESS | | | SCAC4 |
| 4226 | KPBT | KPB TRANSPORTATION LLC | | | SCAC4 |
| 4227 | KPCA | K P CARRIERS INC | | | SCAC4 |
| 4228 | KPCC | KUE PERSONAL CARE PRODUCTS | | | SCAC4 |
| 4229 | KPCD | KONOIKE-PACIFIC CALIFORNIA INC | | | SCAC4 |
| 4230 | KPCHELM | Komunikacja Prywatna, Chełm | | PL | TRAFFIC |
| 4231 | KPCI | KPC INC | | | SCAC3 |
| 4232 | KPCJ | KOPISCHKA, JACK TRUCKING | | | SCAC3 |
| 4233 | KPCL | K P COMFORT LINES | | | SCAC3 |
| 4234 | KPCU | KIRLOSKAR PNEUMATIC CO. LTD. HADAPSAR, PUNE | | IND | BIC |
| 4235 | KPCX | Koppers Industries, Inc. | added 10/1989; 1/1994-7/2005 | | NAKINA |
| 4236 | KPCX | Koppers Co. | 7/1937-4/1938 | | NAKINA |
| 4237 | KPCX | Koppers Co., Inc. | 1/1941-1/1980; eliminated 10/1989 | | NAKINA |
| 4238 | KPCX | Koppers Products Co. | 8/1920; 7/1935 | | NAKINA |
| 4239 | KPCX | Koppers Co., Inc. | 4/38-1/80; eliminated 10/89 | | NRHS |
| 4240 | KPCX | Koppers Industries, Inc. | added 10/89; 1/94-7/2000 | | NRHS |
| 4241 | KPCX | KOPPERS INDUSTRIES, INC. [KOPPERS COMPANY, INC.] | | | PWRC |
| 4242 | KPCX | Koppers Industries | | | RSRV |
| 4243 | KPCX | KOPPERS INDUSTRIES, INC. | | | SCAC4 |
| 4244 | KPCZ | K AND P CARTAGE COMPANY | | | PWRC |
| 4245 | KPCZ | K and P Cartage | | | RSRV |
| 4246 | KPCZ | K & P CARTAGE CO INC | | | SCAC4 |
| 4247 | KPEP | K P EXPRESS | | | SCAC4 |
| 4248 | KPET | KAPLAN, E L TRUCKING CO INC | | | SCAC3 |
| 4249 | KPEU | LLC TC CONTAINER TRANSPORTATION | | RUS | BIC |
| 4250 | KPEV | Königliche Preussische Eisenbahn-Verwaltung | Real: K.P.E.V., Am Anfang: Königlich Preußische und Großherzogliche Hessische Staatseisenbahn | D | TRAFFIC |
| 4251 | KPFA | K & P FARMS | | | SCAC4 |
| 4252 | KPFC | KELLY PROPANE & FUEL LLC | | | SCAC4 |
| 4253 | KPFF | KROPF FARMS | | | SCAC4 |
| 4254 | KPFL | KLUMP TRUCKING LLC | | | SCAC4 |
| 4255 | KPFS | KALITTA AIR (PILOT FREIGHT | | | SCAC4 |
| 4256 | KPGQ | KAP GRISHIN SHIPPING CO., LTD. | | | SCAC3 |
| 4257 | KPGR | KOPPINGER TRUCKING LLC | | | SCAC4 |
| 4258 | KPGW | KNAPP, G W & SON INC | | | SCAC4 |
| 4259 | KPGX | Kentucky Processing Co. | added 1/1997; eliminated 1/1999; 7/2000 (not listed) | | NAKINA |
| 4260 | KPGX | Kentucky Processing Co. | added 1/97; eliminated 1/99; 7/2000 | | NRHS |
| 4261 | KPGX | KENTUCKY PROCESSING COMPANY | | | PWRC |
| 4262 | KPGX | Kentucky Processing | | | RSRV |
| 4263 | KPH | Kazan Plant Of Helicopters | Callsign: Kama, | RUS | AVCODES |
| 4264 | KPH | Kazan Helicopters | | | ICAO1 |
| 4265 | KPHU | KAZPHOSPHA | | | SCAC4 |
| 4266 | KPII | KAPLAN INDUSTRIES INC | | | SCAC3 |
| 4267 | KPIL | KPI LOGISTICS INC | | | SCAC4 |
| 4268 | KPIQ | KIOWA PEAK INDUSTRIES INC | | | SCAC4 |
| 4269 | KPIU | KPIC CORPORATION | | | SCAC4 |
| 4270 | KPJ | Karthago Private Jet | | TN | AVCODES |
| 4271 | KPKC | KRISP-PAK CO INC | | | SCAC4 |
| 4272 | KPKLK | Kopalnia Piasku Kotlamia - Linie Kolejowe sp. Z o.o. | | PL | VKM |
| 4273 | KPKM | Komunalne Przedsiębiorstwo Komunikacji Miejskiej Białystok | City: Białystok | PL | TRAFFIC |
| 4274 | KPKOT | KOPALNIA PIASKU “KOTLARNIA\" SPÓŁKA AKCYJNA | | PL | VKM |
| 4275 | KPKQ | KOEPKE TRUCK LINES | | | SCAC3 |
| 4276 | KPKT | KILPATRICK TRUCKING INC | | | SCAC4 |
| 4277 | KPKU | KRAJMAN PIOTR KRAJEWSKI | | PL | BIC |
| 4278 | KPLD | KINGPIN LOGISTICS LTD | | | SCAC4 |
| 4279 | KPLI | KINLEY PIPELINE COMPANY | | | SCAC3 |
| 4280 | KPLK | K P L TRUCKING | | | SCAC4 |
| 4281 | KPLM | KEPLEY, MALVIN G | | | SCAC3 |
| 4282 | KPLN | KAPLAN TRUCKING INC | | | SCAC3 |
| 4283 | KPLO | KRUPP LONRHO GMBH | | | SCAC3 |
| 4284 | KPLO | KAPELLEN TRANSPORTATION INC | | | SCAC4 |
| 4285 | KPLQ | KAPLAN TRUCKLIN INC | | | SCAC3 |
| 4286 | KPLR | KEPLER BROTHERS INC | | | SCAC3 |
| 4287 | KPLT | KPL TRUCKING INC | | | SCAC4 |
| 4288 | KPLU | K LINE | | | PWRC |
| 4289 | KPLU | K Line | | | RSRV |
| 4290 | KPLX | Western Resources, Inc. | 7/2000-7/2005 | | NAKINA |
| 4291 | KPLX | Agrex, Inc. | added 1/1985; eliminated 1/1988 | | NAKINA |
| 4292 | KPLX | Koppel, Inc. | added 10/1979; 1/1980; eliminated 1/1985 | | NAKINA |
| 4293 | KPLX | Koppel, Inc. | 1/80; eliminated 1/85 | | NRHS |
| 4294 | KPLX | Agrex, Inc. | added 1/85; eliminated 1/88 | | NRHS |
| 4295 | KPLX | Western Resources, Inc. | Jul-00 | | NRHS |
| 4296 | KPLX | WESTAR ENERGY [WESTERN RESOURCES, INC.; AGREX INC.; KOPPEL INC.] | | | PWRC |
| 4297 | KPLX | Koppel (Western Resources) | | | RSRV |
| 4298 | KPLX | WESTERN RESOURCES, INC. | | | SCAC4 |
| 4299 | KPLX | Koppel (Western Resources) | | USA | TRAFFIC |
| 4300 | KPLY | KEEBEE PLAY | | | SCAC4 |
