| 4201 | LKSK | LAKES TRUCKING | | | SCAC3 |
| 4202 | LKSL | LAKESHORE LOGISTICS | | | SCAC4 |
| 4203 | LKSM | LAKESIDE OIL COMPANY INC | | | SCAC4 |
| 4204 | LKSP | L & K TRANSPORT | | | SCAC3 |
| 4205 | LKSP | LAKEN SHIPPING CORPORATION | | | SCAC4 |
| 4206 | LKSQ | LAKE SHORE SYSTEM | | | SCAC3 |
| 4207 | LKSQ | LAKESIDE TRANSPORT | | | SCAC4 |
| 4208 | LKSR | LAKES TRANSPORTATION SERVICE INC | | | SCAC3 |
| 4209 | LKSS | LAKESHORE SERVICE INC | | | SCAC3 |
| 4210 | LKST | LUCKY SEVEN TRUCKING | | | SCAC3 |
| 4211 | LKST | LUCKY SEVEN (7) TRANSPORTATION INC | | | SCAC4 |
| 4212 | LKSV | L & K SERIVCES | | | SCAC3 |
| 4213 | LKSV | L & K SERVICES INC | | | SCAC4 |
| 4214 | LKTB | L & K TRUCKING COMPANY INC | | | SCAC3 |
| 4215 | LKTC | LOOK TRANSPORTATION CO | | | SCAC3 |
| 4216 | LKTC | LOOK TRANSPORTATION INC | | | SCAC4 |
| 4217 | LKTE | LAKEHEAD TRUCKING & EQUIPMENT INC | | | SCAC3 |
| 4218 | LKTF | LACK TRANSFER CO | | | SCAC3 |
| 4219 | LKTF | LUKE TRANSPORTATION INC | | | SCAC4 |
| 4220 | LKTH | L-K TRUCKING INC | | | SCAC3 |
| 4221 | LKTI | L K TRUCKING INC | | | SCAC3 |
| 4222 | LKTK | LOCK TRUCK LINE | | | SCAC3 |
| 4223 | LKTL | LITTLE KING TRANSPORTATION LLC | | | SCAC4 |
| 4224 | LKTM | LAKE TRANSPORT INC | | | SCAC3 |
| 4225 | LKTM | LIGHTNING KHALSA TRANSPORT | | | SCAC4 |
| 4226 | LKTN | LAKE TRUCKING COMPANY | | | SCAC3 |
| 4227 | LKTN | L K TRANSPORT | | | SCAC4 |
| 4228 | LKTO | LAKE TRANSPORT INC | | | SCAC3 |
| 4229 | LKTP | LUCKY TRANSPORT | | | SCAC3 |
| 4230 | LKTQ | LAKESHORE TERMINAL & PIPELINE CO | | | SCAC3 |
| 4231 | LKTQ | LINKERS TRANSPORT & LOGISTICS LTD | | | SCAC4 |
| 4232 | LKTR | LEEK, JAMES TRUCKING | | | SCAC4 |
| 4233 | LKTS | LACKIE TRANSPORTATION SERVICES LTD | | | SCAC3 |
| 4234 | LKTT | LOCKETT TRANSPORTATION INC | | | SCAC3 |
| 4235 | LKTV | LOEPPKY TRANSPORTATION SERVICES | | | SCAC4 |
| 4236 | LKTW | LEEK TRANSFER COMPANY | | | SCAC3 |
| 4237 | LKTW | LEEK TRANSFER CO | | | SCAC4 |
| 4238 | LKTY | L & K TRANSPORT | | | SCAC4 |
| 4239 | LKUK | L & K TRUCKING INC | | | SCAC3 |
| 4240 | LKV | Lukiaviatrans | | RUS | AVCODES |
| 4241 | LKVD | LONESOME K VENTURES LTD | | | SCAC4 |
| 4242 | LKVH | LAKEVIEW VINEYARD EQUIPMENT INC | | | SCAC4 |
| 4243 | LKVK | LAKEVIEW TRUCKING INC | | | SCAC4 |
| 4244 | LKVL | LAKEVILLE MOTOR EXPRESS, INC | | | SCAC3 |
| 4245 | LKVL | LAKEVILLE MOTOR EXPRESS INC | | | SCAC4 |
| 4246 | LKVM | LOCKVIEW MARINA INC | | | SCAC4 |
| 4247 | LKVP | LAKEVIEW PETROLEUM | | | SCAC4 |
| 4248 | LKVQ | LAKEVILLE TRANSFER | | | SCAC3 |
| 4249 | LKVT | LAKEVILLE TAXI COMPANY | | | SCAC3 |
| 4250 | LKVW | LAKEVIEW CARTAGE CO | | | SCAC3 |
| 4251 | LKVW | LAKEVIEW TRUCKING INC | | | SCAC4 |
| 4252 | LKVY | Lykens Valley R.R. Co. | added 4/1978; 1/1980; added 7/1980; eliminated 10/1981 | | NAKINA |
| 4253 | LKVY | Lykens Valley R.R. Co. | added 4/78; 1/80; added 7/80; eliminated 10/81 | | NRHS |
| 4254 | LKVY | LYKENS VALLEY RAILROAD CO. | | | PWRC |
| 4255 | LKW | Top Sky International | | | ICAO1 |
| 4256 | LKWD | LAKES WAREHOUSE DIST INC | | | SCAC4 |
| 4257 | LKWI | LAKEWIND TRANSPORTATION INC | | | SCAC4 |
| 4258 | LKWL | LINKIE, W L TRANSPORTATION INC | | | SCAC4 |
| 4259 | LKWO | LOCKWOOD TRUCKING CO INC | | | SCAC3 |
| 4260 | LKWR | Lackland Western Ry. Co. | 7/2000-7/2005 | | NAKINA |
| 4261 | LKWR | Lackland Western Ry. Co. | Jul-00 | | NRHS |
| 4262 | LKWR | LACKLAND WESTERN RWY. CO. | | | PWRC |
| 4263 | LKWR | Lackland Western Railroad | | | RSRV |
| 4264 | LKWT | LKW TRUCKING INC | | | SCAC4 |
| 4265 | LKX | Linkair Express S.p.A. | IATA: 6M, Callsign: Muttley, Commenced operations in April 2006. | I | AVCODES |
| 4266 | LKX | Larkin Co. Inc. | 7/1935-1/1941 | | NAKINA |
| 4267 | LKX | Larkin Co. Inc. | Apr-38 | | NRHS |
| 4268 | LKX | LARKIN CO. INC. | | | PWRC |
| 4269 | LKXC | LANDSHARK TRANSPORT & LOGISTICS LLC | | | SCAC4 |
| 4270 | LKXS | LAKESHORE EXPRESS INC | | | SCAC4 |
| 4271 | LKXT | LINK TRANSPORT | | | SCAC4 |
| 4272 | LKY | Air Solutions, LLC | Callsign: Lucky, | USA | AVCODES |
| 4273 | LKY | Air Solutions | | | ICAO1 |
| 4274 | LKYD | LUCKY LADY TRUCKING | | | SCAC4 |
| 4275 | LKYE | LUCKY EXPRESS INC | | | SCAC4 |
| 4276 | LKYL | LUCKY LOUNGER | | | SCAC3 |
| 4277 | LKYL | LUCKY LOUNGER | | | SCAC4 |
| 4278 | LKYN | LUCKY TRUCK LINES INC | | | SCAC4 |
| 4279 | LKYQ | LUCKY MOTOR SERVICE INC | | | SCAC3 |
| 4280 | LKYR | LUCKYS DAS N MORE | | | SCAC4 |
| 4281 | LKYS | LUCKY STAR TRAVEL CORPORATION | | | SCAC3 |
| 4282 | LKYS | LUCKY EXPRESS | | | SCAC4 |
| 4283 | LKYT | LUCKYS TRUCKING CO INC | | | SCAC3 |
| 4284 | LL | Lineas Aereas Allegro, S.A. de C.V. | ICAO: GRO, Callsign: Allegro, IATA Prefix: 902, Founded in 1992. Ceased operations during 2004. | MEX | AVCODES |
| 4285 | LL | Loftleidir, Icelandic Airlines Ltd. | Callsign: Loftleidir, | IS | AVCODES |
| 4286 | LL | Aero Lloyd Flugreisen GmbH & Co. | ICAO: AEF, Callsign: Aero Lloyd, Founded on 20 December 1980. Commenced operations in March 1981. IATA designator changed to YP | D | AVCODES |
| 4287 | LL | Miami Air International, Inc. | ICAO: BSK, Callsign: Biscayne, Commenced operations in October 1991. Ceased opeations on 08 May 2020. IATA designator changed from GL* | USA | AVCODES |
| 4288 | LL | China General Aviation Ltd | | PRC | AVCODES |
| 4289 | LL | Poplar River Mine Railroad | | | RSRV |
| 4290 | LLA | Servicio Leo Lopez S.A. de C.V. | Callsign: Leo Lopez, | MEX | AVCODES |
| 4291 | LLA | Servico Leo Lopex | | | ICAO1 |
| 4292 | LLA | Lubelskie Linie Autobusowe | | PL | TRAFFIC |
| 4293 | LLAA | LOGISTICS 1-2-3 LTD | | | SCAC4 |
| 4294 | LLAB | LASER LINES LIMITED | | | SCAC3 |
| 4295 | LLAB | LASER LINES LIMITED | | | SCAC4 |
| 4296 | LLAE | LCG LOGISTICS LLC | | | SCAC4 |
| 4297 | LLAF | LEECO LOGISTICS LLC | | | SCAC4 |
| 4298 | LLAG | LIBERTY LOGISTICS LLC | | | SCAC4 |
| 4299 | LLAK | LANDMARK LOGISTICS INC | | | SCAC4 |
| 4300 | LLAM | LOGISTICA LAM SA DE CV | | | SCAC4 |
