| 501 | LANU | Lancashire United Transport | | GB | TRAFFIC |
| 502 | LANX | Lansing Grain Co., LLC | added 7/2005; 7/2005 | | NAKINA |
| 503 | LANX | LANSING GRAIN CO., LLC | | | PWRC |
| 504 | LANX | LANSING GRAIN COMPANY LLC | | | SCAC4 |
| 505 | LANY | LANDING STRIP, THE | | | SCAC4 |
| 506 | LAO | Lao Aviation | IATA: QV, Callsign: Lao, IATA Prefix: 627, Name changed to Lao Airlines. Designator QV reinstated by IATA | LAO | AVCODES |
| 507 | LAO | Lao Airlines | IATA: QV, Callsign: Lao, IATA Prefix: 627, Name changed from Lao Aviation. Designator QV reinstated by IATA | LAO | AVCODES |
| 508 | LAO | Lao Airlines | IATA: QV | | ICAO1 |
| 509 | LAO | Lao Airlines State Enterprise | | A | TRAFFIC |
| 510 | LAOB | LACEFIELD, OBIE | | | SCAC3 |
| 511 | LAOC | LITTLE ACORN OIL CO | | | SCAC4 |
| 512 | LAOF | LANDMARK FOODS | | | SCAC4 |
| 513 | LAOJ | LOPEZ ARROYO, ALEJANDRO | | | SCAC4 |
| 514 | LAON | LANGSTON, RANDY LEE | | | SCAC4 |
| 515 | LAOP | LATCO TRANSPORT INC | | | SCAC3 |
| 516 | LAOR | LAMBES TRUCKING | | | SCAC3 |
| 517 | LAOR | LA OTRA DE OJINAGA SA DE CV | | | SCAC4 |
| 518 | LAOS | LANDEROS BROS | | | SCAC3 |
| 519 | LAOT | L AND O TRUCKING COMPANY | | | SCAC3 |
| 520 | LAP | TAM Mercosur | IATA: PZ | | ICAO1 |
| 521 | LAPA | LAPLANT TRANSPORT INC | | | SCAC4 |
| 522 | LAPB | LAMPING BLACKTOP INC | | | SCAC3 |
| 523 | LAPB | LAMPING BLACKTOP INC | | | SCAC4 |
| 524 | LAPE | LAPE TRUCKING | | | SCAC3 |
| 525 | LAPF | LAPOINTE & FILS LTEE | | | SCAC3 |
| 526 | LAPH | LANDPHIER, PHIL TRUCKING | | | SCAC3 |
| 527 | LAPI | LAPIERRE USA INC | | | SCAC4 |
| 528 | LAPJ | L AND P EXPRESS OF | | | SCAC4 |
| 529 | LAPK | LAMPKIN TRUCKING CO | | | SCAC3 |
| 530 | LAPK | LODGE AT PARENT LAKE, THE | | | SCAC4 |
| 531 | LAPL | LAPLANTE BROS, INC | | | SCAC3 |
| 532 | LAPL | LAPTON FREIGHT INTERNATIONAL LIMITE | | | SCAC4 |
| 533 | LAPM | LOS ANGELES PAPER BOX & BOARD MILLS | | | SCAC3 |
| 534 | LAPN | LAMPTON-LOVE INC | | | SCAC3 |
| 535 | LAPN | L A PREP INC | | | SCAC4 |
| 536 | LAPO | LAPOINT TRANSPORT INC | | | SCAC3 |
| 537 | LAPP | LINEA AMAZONICA PERUANA SA, PERU | | | SCAC4 |
| 538 | LAPQ | LANGDON, A P INC | | | SCAC3 |
| 539 | LAPR | L A TRANSPORTS | | | SCAC3 |
| 540 | LAPR | LAPPAGE, R & SON TRUCKING LTD | | | SCAC4 |
| 541 | LAPS | LAPIDARIUS | | | SCAC4 |
| 542 | LAPT | Los Angeles Union Passenger Terminal | 1/1975-7/2005 | | NAKINA |
| 543 | LAPT | Los Angeles Union Passenger Terminal | 1/75-7/2000 | | NRHS |
| 544 | LAPT | LOS ANGELES UNION PASSENGER TERMINAL | | | PWRC |
| 545 | LAPT | Los Angeles Union Passenger Terminal | | | RSRV |
| 546 | LAPT | LA PORTE TRANSIT CO | | | SCAC3 |
| 547 | LAPT | LA PORTE TRANSIT CO, INC | | | SCAC4 |
| 548 | LAPV | LAPADULA & VILLANI INCORPORATED | | | SCAC3 |
| 549 | LAPW | LAPIERRE WATERLOO SMALL INC | | | SCAC4 |
| 550 | LAPX | General American Transportation Corp. | 4/1970-1/1980; eliminated 10/1992 | | NAKINA |
| 551 | LAPX | Linde Air Products Co. (General American Transportation Co.) | 10/1966 | | NAKINA |
| 552 | LAPX | General American Transportation Corp. | 1/1943-7/1965 | | NAKINA |
| 553 | LAPX | Linde Air Products Co. | 1/1941 | | NAKINA |
| 554 | LAPX | General American Transportation Corp. | 1/52-7/65 | | NRHS |
| 555 | LAPX | Linde Air Products Co. (General American Transportation Co.) | Oct-66 | | NRHS |
| 556 | LAPX | General American Transportation Corp. | 4/70-1/80; eliminated 10/92 | | NRHS |
| 557 | LAPX | *LABELLE POINT RAILROAD | | | PWRC |
| 558 | LAPX | *(GATX) RETIRED 08-19-92 ATP (1323) [LINDE AIR PRODUCTS CO.] | | | PWRC |
| 559 | LAPX | Linde Air Products (GATX) | | | RSRV |
| 560 | LAQ | Lebanese Air Transport | IATA: LQ, Callsign: LAT, Designator LQ recalled by IATA | RL | AVCODES |
| 561 | LAQ | Lebanese Air Transport | IATA: LQ | | ICAO1 |
| 562 | LAQC | LANTIK COURIER LTD | | | SCAC4 |
| 563 | LAQE | LATIN AMERICA EXPRESS CORP. | | | SCAC3 |
| 564 | LAQN | LAND SPAN LOGISTICS | | | SCAC4 |
| 565 | LAQR | LAWRY SHOOTING SPORTS INC | | | SCAC4 |
| 566 | LAQS | L A QWIK SERVE TRANSPORTATION | | | SCAC4 |
| 567 | LAQT | L A TRUCKING (1994) LTD | | | SCAC4 |
| 568 | LAR | Lawrence Aviation, Inc. | Callsign: Lawrence, | USA | AVCODES |
| 569 | LAR | Lawrence Aviation | | | ICAO1 |
| 570 | LARA | LARANDAE SERVICES INC | | | SCAC3 |
| 571 | LARA | LARSON, A TRUCKING | | | SCAC4 |
| 572 | LARB | LARRICK TRANSPORTATION | | | SCAC3 |
| 573 | LARD | LAIRD, R INC | | | SCAC3 |
| 574 | LARD | L A ROSSMAN DISTRIBUTING INC | | | SCAC4 |
| 575 | LARE | LARAMIE, INC | | | SCAC3 |
| 576 | LARF | L A R R S ENTERPRISES INC | | | SCAC4 |
| 577 | LARH | LARRIMORE, HOWARD | | | SCAC3 |
| 578 | LARH | LARAS TRUCKING | | | SCAC4 |
| 579 | LARI | LARIMORE TRUCKING | | | SCAC4 |
| 580 | LARJ | LAURITZEN, J A/S | | | SCAC3 |
| 581 | LARJ | LAURITZEN, J A/S | | | SCAC4 |
| 582 | LARK | LOUISIANA ARKANSAS & TEXAS TRANS CO | | | SCAC3 |
| 583 | LARK | LARK TRANSPORT INC | | | SCAC4 |
| 584 | LARM | LECHUGA, RAMIRO | | | SCAC4 |
| 585 | LARM | Armchair Passenger Transport | | GB | TRAFFIC |
| 586 | LARO | L & R OILFIELD SERVICE INC | | | SCAC3 |
| 587 | LARO | LAR TRANSPORTATION | | | SCAC4 |
| 588 | LARP | LARSEN PRODUCE, INC | | | SCAC3 |
| 589 | LARP | LARRYS TRUCKING | | | SCAC4 |
| 590 | LARQ | LAR ROCHELLE INC | | | SCAC3 |
| 591 | LARQ | L & R TRUCKING CO INC | | | SCAC4 |
| 592 | LARS | LARSON, STEVE TRUCKING INC | | | SCAC4 |
| 593 | LART | LARSEN TRUCKING, INC | | | SCAC3 |
| 594 | LARU | LAROUTE SA | | CH | BIC |
| 595 | LARU | LANAN, INC. | | | PWRC |
| 596 | LARU | Lanan | | | RSRV |
| 597 | LARU | LANAN, INC. | | | SCAC3 |
| 598 | LARW | LARMORE INCORPORATED | | | SCAC3 |
| 599 | LARW | Louisana & Arkansas Ry. | Real: LA | USA | TRAFFIC |
| 600 | LARX | Ashland Oil & Refining Co. | added 1/1963; 7/1965-10/1966; eliminated 4/1970 | | NAKINA |
