| 1 | LP | Lan Peru, S.A. | ICAO: LPE, Callsign: Patagonia, IATA Prefix: 544, Name changed to Lan Peru, S.A. d/b/a LATAM Airlines Peru w.e.f. 05 May 2016. Changed from Air Patagonia - Linea Aerea Del Sur S.A. ICAO changed from PTG | PE | AVCODES |
| 2 | LP | Linea Aerea Del Sur, S.A. | ICAO: PTG, Changed to Lan Peru S.A. ICAO changed to LPE | PE | AVCODES |
| 3 | LP | The Hawaii Express | ICAO: HEA, Ceased operations | USA | AVCODES |
| 4 | LP | La Tur Airlines | ICAO: LPT, Callsign: Latur, Ceased operations | MEX | AVCODES |
| 5 | LP | Société Air Alpes | ICAO: ALP, Merged into TAT | F | AVCODES |
| 6 | LP | Lan Peru, S.A. d/b/a LATAM Airlines Peru | ICAO: LPE, Callsign: Lanperu, IATA Prefix: 544, Name changed from Lan Peru, S.A. w.e.f. 05 May 2016. Changed from Air Patagonia - Linea Aerea Del Sur S.A. ICAO changed from PTG | PE | AVCODES |
| 7 | LP | Lincoln Pacific Railway | | | RSRV |
| 8 | LPA | PAL Aerolineas, S.A. de C.V. | Callsign: Lineaspal, | MEX | AVCODES |
| 9 | LPA | Air Large European Aviation Project t/a Air Leap | IATA: FL, Callsign: Leap, Ceased operation on 24 January 2022 and filed for reorganisation. | S | AVCODES |
| 10 | LPA | Pal Aerolineas | | | ICAO1 |
| 11 | LPAC | LES PRODUITS ALIMENTAIRES DURAN INC | | | SCAC4 |
| 12 | LPAI | LES PRODUCTIONS ATLAN INC | | | SCAC4 |
| 13 | LPAL | LA PALMITA | | | SCAC4 |
| 14 | LPAM | LOPEZ, PEDRO ABRAHAM | | | SCAC4 |
| 15 | LPAN | LOPEZ, ANTONIETA | | | SCAC4 |
| 16 | LPAQ | LAUSIER, P A TRUCKING | | | SCAC3 |
| 17 | LPAQ | L P A SERVICE | | | SCAC4 |
| 18 | LPAR | LOGISTICS PARTNERS COMPANY | | | SCAC3 |
| 19 | LPAS | LEP INTERNATIONAL PTY LTD | | | SCAC3 |
| 20 | LPAX | The Lake Asphalt and Petroleum Co. of Pennsylvania | 7/1937-7/1965 (not listed) | | NAKINA |
| 21 | LPAX | The Lake Asphalt and Petroleum Co. of Pennsylvania | 1/52-7/65 | | NRHS |
| 22 | LPAX | LAKE ASPHALT & PETROLEUM CO. OF PENNSYLVANIA | | | PWRC |
| 23 | LPB | The Louisiana & Pine Bluff Ry. Co. | 1/1975; eliminated 10/1979 | | NAKINA |
| 24 | LPB | The Louisiana & Pine Bluff Ry. Co. | Jan-75 | | NRHS |
| 25 | LPB | LOUISIANA & PINE BLUFF RWY.D CO. | | | PWRC |
| 26 | LPB | Locarno - Ponte Brolla - Bignasco | | CH | TRAFFIC |
| 27 | LPBC | LAMPE BLOCK COMPANY | | | SCAC3 |
| 28 | LPBD | LOS PLEBES | | | SCAC4 |
| 29 | LPBE | LEP INTERNATIONAL NV | | | SCAC3 |
| 30 | LPBO | LOSINJSKA PLOVIDBA BRODARSTVO D O O | | | SCAC4 |
| 31 | LPBR | LEP INTERNATINAL DO BRASIL LTDA | | | SCAC3 |
| 32 | LPBR | LAUREL TRANSPORT | | | SCAC4 |
| 33 | LPC | Alpine Aviation | Callsign: Apline Charter, | ZA | AVCODES |
| 34 | LPC | Alpine Aviation (Pty) Ltd | Callsign: Netstar, | ZA | AVCODES |
| 35 | LPC | Alpine Aviation | | | ICAO1 |
| 36 | LPC | LEHIGH PORTLAND CEMENT | | | PWRC |
| 37 | LPCA | LE PROJET CARDBOARD BOX INC | | | SCAC4 |
| 38 | LPCB | LOADPOWER OF COLUMBUS | | | SCAC3 |
| 39 | LPCB | LOPEZ BARRAGAN, PAULO CESAR | | | SCAC4 |
| 40 | LPCE | LEPCO ENTERPRISES INC | | | SCAC3 |
| 41 | LPCE | LAKE NORMAN EXPEDITE INC | | | SCAC4 |
| 42 | LPCK | L P TRUCKING | | | SCAC4 |
| 43 | LPCL | LAREDO POWER CONTAINERS LLC | | | SCAC4 |
| 44 | LPCM | L P CUSTOM MACHINING LTD | | | SCAC4 |
| 45 | LPCN | LA PAZ COMPANIA BAVIERA S A | | | SCAC3 |
| 46 | LPCN | LOLLY POP CHILDRENS WEAR CO | | | SCAC4 |
| 47 | LPCO | LOUISIANA-PACIFIC CORPORATION | | | SCAC3 |
| 48 | LPCR | LEELANAU TRANSIT COMPANY | | | PWRC |
| 49 | LPCU | CATERPILLAR (NI) LTD | | GB | BIC |
| 50 | LPCU | FG WILSON (ENGINEERING) LTD | | | SCAC4 |
| 51 | LPCX | Lehigh Portland Cement Co. | 7/1935-10/1966; eliminated 1/1969 | | NAKINA |
| 52 | LPCX | Lehigh Portland Cement Co. | 4/38-10/66; eliminated 1/69 | | NRHS |
| 53 | LPCX | LEJIGH PORTLAND CEMENT CO. | | | PWRC |
| 54 | LPCX | LEHIGH PORTLAND CEMENT CO | | | SCAC3 |
| 55 | LPCZ | FLEXI-VAN LEASING INC | | | SCAC4 |
| 56 | LPD | UK Royal / H.R.H. Duke of York | Callsign: Leopard, | GB | AVCODES |
| 57 | LPD | UK Royal/HRH Duke of York | | | ICAO1 |
| 58 | LPDA | LEPAGE, D A TRANSPORT LTD | | | SCAC4 |
| 59 | LPDE | LASSEN GMBH | | | SCAC3 |
| 60 | LPDM | LPD, INC | | | SCAC3 |
| 61 | LPDP | LES PRODUITS DE PAPIER LAPACO LTEE | | | SCAC4 |
| 62 | LPDS | LP INDUSTRIES | | | SCAC4 |
| 63 | LPDT | LOGISTICS PLUS DISTRIBUTION TRANSPO | | | SCAC4 |
| 64 | LPDY | LIQUID PETROLEUM DELIVERY | | | SCAC4 |
| 65 | LPE | Lan Peru, S.A. | IATA: LP, Callsign: Patagonia, IATA Prefix: 544, Name changed to Lan Peru, S.A. d/b/a LATAM Airlines Peru w.e.f. 05 May 2016. Changed from Air Patagonia - Linea Aerea Del Sur S.A. ICAO changed from PTG | PE | AVCODES |
| 66 | LPE | Lan Peru, S.A. d/b/a LATAM Airlines Peru | IATA: LP, Callsign: Lanperu, IATA Prefix: 544, Name changed from Lan Peru, S.A. w.e.f. 05 May 2016. Changed from Air Patagonia - Linea Aerea Del Sur S.A. ICAO changed from PTG | PE | AVCODES |
| 67 | LPE | LAN Peru | IATA: LP | | ICAO1 |
| 68 | LPEL | LACHAPELLE OIL & HEATING CO INC | | | SCAC4 |
| 69 | LPEM | LACHUTE PERFORMANCE | | | SCAC4 |
| 70 | LPEP | LAPERCO ENTREPRISES, LES | | | SCAC3 |
| 71 | LPER | LINEAS PERSOTO SA DE CV | | | SCAC4 |
| 72 | LPES | LEP INTERNATIONAL CATALUNYA SA | | | SCAC3 |
| 73 | LPES | LOPEZ GARZA, JAIME LEONEL | | | SCAC4 |
| 74 | LPET | LILYBLAD PETROLEUM INC | | | SCAC3 |
| 75 | LPEW | LAMPSIS E N E | | | SCAC4 |
| 76 | LPFC | LES PRODUITS FRACO LTEE | | | SCAC4 |
| 77 | LPFD | LA PREFERIDA INC | | | SCAC4 |
| 78 | LPFL | LEPLEY FARM LINES INC | | | SCAC3 |
| 79 | LPFM | LAPLANTE FARMS | | | SCAC4 |
| 80 | LPFR | LEP INTERNATIONAL (FRANCE) SA | | | SCAC3 |
| 81 | LPFS | LAP FREIGHT SYSTEMS | | | SCAC4 |
| 82 | LPG | Locomotives Pool GmbH | | DE | VKM |
| 83 | LPGA | LOPEZ GALLEGOS, ANGEL | | | SCAC4 |
| 84 | LPGB | LEP INTERNATIONAL LTD | | | SCAC3 |
| 85 | LPGC | LAPREYROUSE GRAIN CORP OF MISS INC | | | SCAC3 |
| 86 | LPGE | LEPAGE & EATON COUNTERTOPS INC | | | SCAC4 |
| 87 | LPGI | LES PETROLES GLS INC | | | SCAC4 |
| 88 | LPGP | LOGISTICS PLUS INC | | | SCAC4 |
| 89 | LPGS | LANCASTER PROPANE GAS INC | | | SCAC4 |
| 90 | LPGT | L P G TRANSPORTATION CORP | | | SCAC3 |
| 91 | LPGT | LEPY, GEORGE TRUCKING INC | | | SCAC4 |
| 92 | LPGU | NAFTAENERGO | | | SCAC4 |
| 93 | LPGV | LPG VENTURES INC | | | SCAC4 |
| 94 | LPGX | Lancaster Petroleum Gas, Inc. | 7/2005 (not listed) | | NAKINA |
| 95 | LPGX | Universal LPGX Co. | added 10/1977; 1/1980; eliminated 7/1984 | | NAKINA |
| 96 | LPGX | Universal Butane Co. | added 7/1962; 7/1965-1/1975; eliminated 10/1977 | | NAKINA |
| 97 | LPGX | Liquified Petroleum Gas Co. | 8/1920-7/1923 | | NAKINA |
| 98 | LPGX | Universal Butane Co. | 7/65-1/75 | | NRHS |
| 99 | LPGX | Universal LPGX Co. | 1/80; eliminated 7/84 | | NRHS |
| 100 | LPGX | *LIQUIFIED PETROLEUM GAS CO. | | | PWRC |
