| 1501 | IKYT | IKY TRUCKING | | | SCAC4 |
| 1502 | IL | Istanbul Airlines A.S. | ICAO: IST, Callsign: Istanbul, Ceased operations on 25 August 2000. | TR | AVCODES |
| 1503 | IL | Arctic | ICAO: AEB, Callsign: Air Arctic, | IS | AVCODES |
| 1504 | IL | Lineas Aereas Nacionales S.A. (LANSA) | | PE | AVCODES |
| 1505 | IL | Lankair Private Limited | ICAO: LKN, Callsign: Lank Air, | CL | AVCODES |
| 1506 | IL | Trigana Air Service P.T. | ICAO: TGN, Callsign: Trigana, | RI | AVCODES |
| 1507 | IL | Inselbahn Langeoog | Langeoog | D | privat-bahn.de |
| 1508 | IL | Interliner | | NL | TRAFFIC |
| 1509 | IL | Island Line | | UK | VKM |
| 1510 | ILA | Islena de Aviacion | Callsign: Islena, Ceased operations in 1995 | CO | AVCODES |
| 1511 | ILA | Elan Arad | | IL | AVCODES |
| 1512 | ILAC | I L S CONTAINER LINE | | | SCAC4 |
| 1513 | ILAF | Israeli Air Force | | IL | TRAFFIC |
| 1514 | ILAN | INTERNATIONAL TRANSPORTATION | | | SCAC4 |
| 1515 | ILAY | ILLINOIS AYERS OIL CO | | | SCAC4 |
| 1516 | ILBK | ILLINOIS BULK CARRIER, INC | | | SCAC1 |
| 1517 | ILBK | ILLINOIS BULK CARRIER INC | | | SCAC4 |
| 1518 | ILBL | ILB LOGISTICS LLC | | | SCAC4 |
| 1519 | ILBU | ILB INTERFREIGHT LOGISTICS BENELUX BV | | NL | BIC |
| 1520 | ILC | Ilas Co., Ltd | | J | AVCODES |
| 1521 | ILC | Island Link | | | ICAO1 |
| 1522 | ILCC | INTERNATIONAL LIQUID CARRIERS INC | | | SCAC4 |
| 1523 | ILCE | I L CARRIERS AND WAREHOUSE | | | SCAC4 |
| 1524 | ILCI | INLAND CRANE INC | | | SCAC4 |
| 1525 | ILCN | INTERLINE CONNECTION | | | SCAC1 |
| 1526 | ILCN | INTERLINE CONNECTION N V | | | SCAC4 |
| 1527 | ILCO | IMPERIAL LEASING CO | | | SCAC4 |
| 1528 | ILCQ | INTERNATIONAL LIQUID CHARTERERS BV | | | SCAC4 |
| 1529 | ILCU | TRANSAFE SERVICES LIMITED | | IND | BIC |
| 1530 | ILCU | BALMER LAWRIE & COMPANY LTD. | | | SCAC3 |
| 1531 | ILCU | BALMER LAWRIE & COMPANY LTD. | | | SCAC4 |
| 1532 | ILCV | INTERGLOBAL LOGISTICS CORP | | | SCAC4 |
| 1533 | ILCX | International Latex Corp. | added 7/1960; 4/1961; eliminated 4/1963; added 7/1964; 7/1965-10/1966; eliminated 10/1968 | | NAKINA |
| 1534 | ILCX | International Latex Corp. | added 7/60; 4/61; added 7/64; 7/65-10/66; eliminated 10/68 | | NRHS |
| 1535 | ILCX | INTERNATIONAL LAT3EX CORP. | | | PWRC |
| 1536 | ILD | Ilerdair, S.L. | | E | AVCODES |
| 1537 | ILDN | INLAND TRANSPORTATION CORP | | | SCAC4 |
| 1538 | ILDR | INLAND STAR EXPRESS | | | SCAC4 |
| 1539 | ILDS | INTERNATIONAL LOGISTICS & DISTRIBUT | | | SCAC4 |
| 1540 | ILDX | General Electric Co.—Lighting Business Group | added 4/1978; 1/1980-1/1994; eliminated 7/1997; 7/2000-7/2005 (not listed) | | NAKINA |
| 1541 | ILDX | General Electric Co., Lamp Business Group | added 1/1978; eliminated 4/1978 | | NAKINA |
| 1542 | ILDX | General Electric Co., Lamp Business Division | added 7/1974; 1/1975; eliminated 1/1978 | | NAKINA |
| 1543 | ILDX | Lamp Division of General Electric Co. | 4/1970; eliminated 7/1974 | | NAKINA |
| 1544 | ILDX | Incandescent Lamp Division of General Electric Co. | 10/1966 | | NAKINA |
| 1545 | ILDX | Lamp Division of General Electric Co. | 1/1952-7/1965 | | NAKINA |
| 1546 | ILDX | Lamp Dept. of General Electric Co. | 1/1941-1/1950 | | NAKINA |
| 1547 | ILDX | Incandescent Lamp Department of General Electric Co. | 7/1930-4/1938 | | NAKINA |
| 1548 | ILDX | Incandescent Lamp Department of General Electric Co. | Apr-38 | | NRHS |
| 1549 | ILDX | Lamp Division of General Electric Co. | 1/52-7/65 | | NRHS |
| 1550 | ILDX | Incandescent Lamp Division of General Electric Co. | Oct-66 | | NRHS |
| 1551 | ILDX | Lamp Division of General Electric Co. | Apr-70 | | NRHS |
| 1552 | ILDX | General Electric Co., Lamp Business Division | 1/75; eliminated 1/78 | | NRHS |
| 1553 | ILDX | General Electric Co., Lamp Business Group | added 1/78; eliminated 4/78 | | NRHS |
| 1554 | ILDX | General Electric Co.--Lighting Business Group | added 4/78; 1/80-1/94; eliminated 7/97; 7/2000 | | NRHS |
| 1555 | ILDX | GENERAL ELECTRIC COMPANY - LIGHTING BUSINESS GROUP | | | PWRC |
| 1556 | ILDX | General Electric Lighting Business Group | | | RSRV |
| 1557 | ILDX | LAMP DIVISION OF GENERAL ELECTRIC C | | | SCAC3 |
| 1558 | ILDX | GENERAL ELECTRIC RAILCAR SERVICES C | | | SCAC4 |
| 1559 | ILDX | General Electric Co. Lighting Business Group | | USA | TRAFFIC |
| 1560 | ILE | Air Saint-Tropez | Callsign: Saint-Tropez, | F | AVCODES |
| 1561 | ILE | Jet Port South, LLC | | RUS | AVCODES |
| 1562 | ILER | ILERI DENIZCILK VE TICARET AS | | | SCAC4 |
| 1563 | ILF | Ilyushin, S.U., Aviation Complex, Joint-Stock Company | Callsign: IL-Complex, | RUS | AVCODES |
| 1564 | ILF | Island Air Charters | | | ICAO1 |
| 1565 | ILFD | ILLINOIS FLUSH DOOR | | | SCAC4 |
| 1566 | ILFU | ООО «IRKUTSK OIL COMPANY» | | RUS | BIC |
| 1567 | ILGA | INTLOG USA | | | SCAC4 |
| 1568 | ILGB | INTEGRATED LOGISTICS 2000 LLC | | | SCAC4 |
| 1569 | ILGE | INTERLINE LOGISTICS GROUP | | | SCAC4 |
| 1570 | ILGJ | ITOCHU LOGISTICS CORP | | | SCAC4 |
| 1571 | ILGK | INTERNATIONAL LOGISTICS SOLUTIONS C | | | SCAC4 |
| 1572 | ILGL | ILG INVESTMENT & LEASING GROUP INC | | | SCAC4 |
| 1573 | ILGN | ILLINOIS LOGISTICS GROUP | | | SCAC4 |
| 1574 | ILGO | INTEL-LOGISTICS INC | | | SCAC4 |
| 1575 | ILGP | INTERNATIONAL LOGISTICS GROUP | | | SCAC4 |
| 1576 | ILGQ | INTERNATIONAL | | | SCAC4 |
| 1577 | ILGR | ISLAND GARDEN CO-OPERATIVE LTD | | | SCAC4 |
| 1578 | ILGS | INTERNATIONAL LOGISTICS SERVICES | | | SCAC4 |
| 1579 | ILGT | INTERDEL LOGISTICS INC | | | SCAC4 |
| 1580 | ILGU | ILGINNOVATIVE LOGISTICS GROUP GMBH | | A | BIC |
| 1581 | ILHC | INTERSTATE LINE HAUL INC | | | SCAC4 |
| 1582 | ILHU | INTERLOGISTICS LLC | | RUS | BIC |
| 1583 | ILI | Inter City Airways, Inc. | Callsign: Interair, | USA | AVCODES |
| 1584 | ILI | INN LIMOUSINE INC | | | SCAC4 |
| 1585 | ILIA | INFINITY LOGISTICS INTERNATIONAL CO | | | SCAC4 |
| 1586 | ILID | ICELAND LIMITED | | | SCAC4 |
| 1587 | ILIF | IRONMAN LOGISTICS INC | | | SCAC4 |
| 1588 | ILIJ | INGAS LOGISTICS INC | | | SCAC4 |
| 1589 | ILIK | IRONTIGER LOGISTICS INC | | | SCAC4 |
| 1590 | ILIN | INTEGRI-LINE INC | | | SCAC4 |
| 1591 | ILIO | INFINITI LOGISTICS INC | | | SCAC4 |
| 1592 | ILIP | IMPALA LOGISTICS, INC. | | | SCAC4 |
| 1593 | ILIQ | IDEAL LOGISTICS INC | | | SCAC4 |
| 1594 | ILIU | Tank Containers | | | RSRV |
| 1595 | ILIU | INTERMODAL LOGISTICS INC | | | SCAC4 |
| 1596 | ILK | Aero Airline PLC | Callsign: Ilek, | KZ | AVCODES |
| 1597 | ILK | Aero Airline | | | ICAO1 |
| 1598 | ILKC | INTERLAKE COLONY FARMS | | | SCAC4 |
| 1599 | ILKU | BOTHRA SHIPPING SERVICES | | | SCAC4 |
| 1600 | ILL | Ilyich-Avia | | | ICAO1 |
