| 1601 | ILL | | | USA | TRAFFIC |
| 1602 | ILLA | INTERNATIONAL LOGISTICS LLC | | | SCAC4 |
| 1603 | ILLB | INTRANSIT LLC | | | SCAC4 |
| 1604 | ILLC | ILLUSIONS UNLIMITED | | | SCAC4 |
| 1605 | ILLD | ISCONT LINES LIMITED | | | SCAC4 |
| 1606 | ILLG | INTEL LOGISTICS LLC | | | SCAC4 |
| 1607 | ILLL | ITELLA LOGISTICS A/S | | | SCAC4 |
| 1608 | ILLN | INTERCHANGE LOGISTICS LLC | | | SCAC4 |
| 1609 | ILLO | INTERSTARR LOGISTICS LLC | | | SCAC4 |
| 1610 | ILLQ | INDUS LOGISTICS LLC | | | SCAC4 |
| 1611 | ILLU | INDICON LOGISTICS LIMITED | | | SCAC4 |
| 1612 | ILM | Jetcapital Aviation | Callsign: Birdman, | P | AVCODES |
| 1613 | ILM | Ilmebahn GmbH | Einbeck | D | privat-bahn.de |
| 1614 | ILM | Ilmebahn GmbH | | D | TRAFFIC |
| 1615 | ILM | Ilmebahn | | DE | VKM |
| 1616 | ILMR | ILMOR ENGINEERING INC | | | SCAC4 |
| 1617 | ILMT | INDUSTRIAS LA MESA DE TIJUANA S A | | | SCAC4 |
| 1618 | ILMU | FLOW LINE TRANSPORT | | | PWRC |
| 1619 | ILMU | Flow Line Transport | | | RSRV |
| 1620 | ILMU | ILTIS EMERGENCY SERVICE | | | SCAC4 |
| 1621 | ILN | Inter-Aviation Services d/b/a Inter-Air | IATA: D6, Callsign: Inline, IATA Prefix: 625, Name changed to Inter-Aviation Services d/b/a Interair South Africa | ZA | AVCODES |
| 1622 | ILN | Inter Air Lines (Pty) Ltd South Africa | Callsign: Inline, | ZA | AVCODES |
| 1623 | ILN | Inter-Aviation Services d/b/a Interair South Africa | IATA: D6, Callsign: Inline, IATA Prefix: 625, Name changed from Inter-Aviation Services d/b/a Inter-Air | ZA | AVCODES |
| 1624 | ILN | Interair South Africa | IATA: D6 | | ICAO1 |
| 1625 | ILNC | INDUSTRIAL LUBRICANT COMPANY | | | SCAC4 |
| 1626 | ILNE | INTERLINE MOTOR FREIGHT INC | | | SCAC4 |
| 1627 | ILNH | IN LINE HOTSHOT & TRUCKING INC | | | SCAC4 |
| 1628 | ILNO | INLAND OIL & PROPANE | | | SCAC4 |
| 1629 | ILNQ | ILLINI STATE TRUCKING CO | | | SCAC4 |
| 1630 | ILNT | INTERNATIONAL NUTRITION | | | SCAC4 |
| 1631 | ILNU | INVERSIONES LORD NELSON C/O O M P I | | | SCAC4 |
| 1632 | ILO | Wojciech Iłowiecki | | PL | VKM |
| 1633 | ILOB | INTERPORT LOGISTICS | | | SCAC4 |
| 1634 | ILOD | ILOAD | | | SCAC4 |
| 1635 | ILOE | INTERMODAL LOGISTICS OF SOUTH TEXAS | | | SCAC4 |
| 1636 | ILOG | INTERSTATE LOGISTICS INC | | | SCAC4 |
| 1637 | ILOI | INTERIDE LOGISTICS LC | | | SCAC4 |
| 1638 | ILON | ILLINI LOGISTICS | | | SCAC4 |
| 1639 | ILOQ | INTERSTATE LOGISTICS | | | SCAC4 |
| 1640 | ILOT | INTEGRACION LOGISTICA | | | SCAC4 |
| 1641 | ILP | ILPO Aruba Cargo N.V. | | ARU | AVCODES |
| 1642 | ILP | Ilpo Aruba Cargo | | | ICAO1 |
| 1643 | ILPZ | ILLINOIS POWER CO. | | | PWRC |
| 1644 | ILQI | IMPALA LOGISTIC INC | | | SCAC4 |
| 1645 | ILRL | ILAR LLC | | | SCAC4 |
| 1646 | ILRU | CJSC INTEGRATED LOGISTICS | | | SCAC4 |
| 1647 | ILS | Servicios Aereos Ilsa, S.A. de C.V. | Callsign: Servicios Ilsa, | MEX | AVCODES |
| 1648 | ILS | Servicios Aereos Ilsa | | | ICAO1 |
| 1649 | ILSA | INTERNATIONAL LOGISTIC SERVICES INC | | | SCAC4 |
| 1650 | ILSB | INLOG LOGISTICS SOLUTIONS | | | SCAC4 |
| 1651 | ILSD | INDUSTRIA LLANTAS S DE RL DE CV | | | SCAC4 |
| 1652 | ILSE | INTEGRATED LOGISTICS SERVICES INC | | | SCAC4 |
| 1653 | ILSF | INTEGRITY LOGISTICS & SUPPLY CHAIN | | | SCAC4 |
| 1654 | ILSG | IMPERIAL LOGISTIC SERVICES LLC | | | SCAC4 |
| 1655 | ILSJ | ILS TRUCKING | | | SCAC4 |
| 1656 | ILSP | INFINITE LOGISTICS SERVICE CORP | | | SCAC4 |
| 1657 | ILSQ | INTEGRA LOGISTICS SERVICES INC (INT | | | SCAC4 |
| 1658 | ILSS | INTEGRATED LINE | | | SCAC4 |
| 1659 | ILST | ILS INTERNATIONAL LOGISTICS SOLUTIO | | | SCAC4 |
| 1660 | ILSU | INTERNATIONAL LOGISTICS SUPPORT LIM | | | SCAC4 |
| 1661 | ILSV | INTEGRA LOGISTICS SERVICES INC | | | SCAC4 |
| 1662 | ILSX | Independent Locomotive Service, Inc. | 7/2000-7/2005 (not listed) | | NAKINA |
| 1663 | ILSX | Independent Locomotive Service, Inc. | Jul-00 | | NRHS |
| 1664 | ILSX | INDEPENDENT LOCOMOTIVE SERVICE | | | PWRC |
| 1665 | ILSX | Independent Locomotive Service | | | RSRV |
| 1666 | ILSX | Independent Locomotive Service, Inc. | | USA | TRAFFIC |
| 1667 | ILTA | IL&TA TRANSPORTATION INC | | | SCAC4 |
| 1668 | ILTC | I & L TRUCKING | | | SCAC4 |
| 1669 | ILTD | INTELET LTD | | | SCAC4 |
| 1670 | ILTE | ILLINOIS TRUCK TRANSFER | | | SCAC4 |
| 1671 | ILTK | I LOAD TRUCK LINES | | | SCAC4 |
| 1672 | ILTP | INTERNATIONALE TRANSPORT | | | SCAC4 |
| 1673 | ILTU | SOLVOCHEM HOLLAND BV | | NL | BIC |
| 1674 | ILTU | INTERNATIONAL LIQUID TRANSPORT CO. BV | | | PWRC |
| 1675 | ILTU | International Liquid Transport | | | RSRV |
| 1676 | ILTU | INTERNATIONAL LIQUID TRANSPORT BV | | | SCAC4 |
| 1677 | ILTW | INTERGRADE LTD | | | SCAC4 |
| 1678 | ILU | University of Illinois Institute of Aviation | Callsign: Illini, Name changed to Institute of Aviation at Parkland College. | USA | AVCODES |
| 1679 | ILU | Institute of Aviation at Parkland College | Callsign: Illini, Name changed from University of Illinois Institute of Aviation. | USA | AVCODES |
| 1680 | ILUU | INSTITUTE OF INT CONTAINER LESSORS (IICL) | | USA | BIC |
| 1681 | ILUU | Institute Of International Container Lessors | | | RSRV |
| 1682 | ILUU | INSTITUTE OF INTERNATIONAL CONTAINE | | | SCAC4 |
| 1683 | ILV | IL-Avia | Callsign: Ilavia, | RUS | AVCODES |
| 1684 | ILV | Il-Avia | | | ICAO1 |
| 1685 | ILVA | ILVA SERVIZI MARITIMI SPA | | | SCAC4 |
| 1686 | ILVA | Ilva di Taranto Steel Works | | I | TRAFFIC |
| 1687 | ILW | Illinois Western R.R. Co. | 7/2000-7/2005 | | NAKINA |
| 1688 | ILW | Illinois Western R.R. Co. | Jul-00 | | NRHS |
| 1689 | ILW | ILLINOIS WESTERN RAILROAD CO. | | | PWRC |
| 1690 | ILW | Illinois Western Railroad | | | RSRV |
| 1691 | ILW | ILLINOIS WESTERN RAILROAD COMPANY | | | SCAC4 |
| 1692 | ILWH | INTERNATIONAL TRUCKING GROUP INC | | | SCAC4 |
| 1693 | ILX | Great American Farm Implement Corp. | 7/1954-10/1957; eliminated 4/1958 | | NAKINA |
| 1694 | ILX | Inland Molasses Co. | 1/1952 | | NAKINA |
| 1695 | ILX | Inland Molasses Co. | Jan-52 | | NRHS |
| 1696 | ILX | Great American Farm Implement Corp. | Oct-57 | | NRHS |
| 1697 | ILX | GREAT AMERICAN FARM IMPLEMENT CO. [INLAND MOLASSES CO.] | | | PWRC |
| 1698 | ILXD | INTEGRA LOGISTICS SERVICES INC (EXP | | | SCAC4 |
| 1699 | ILXE | INTRANS ILLINOIS EXPRESS, INC | | | SCAC1 |
| 1700 | ILXE | INTRANS ILLINOIS EXPRESS INC | | | SCAC4 |
