| 1001 | IFB | INTERFERRYBOATS NV | | BE | VKM |
| 1002 | IFBN | IMPERIAL FREIGHT BROKERS INC | | | SCAC4 |
| 1003 | IFBX | General Electric Rail Services Corp. | added 1/2000; 7/2000-7/2005 | | NAKINA |
| 1004 | IFBX | General Electric Railcar Services Corp. | added 4/1990; 1/1994; eliminated 1/2000 | | NAKINA |
| 1005 | IFBX | Indiana Farm Bureau Cooperative Association, Inc. | added 7/1979; 1/1980; eliminated 4/1990 | | NAKINA |
| 1006 | IFBX | Indiana Farm Bureau Cooperative Association, Inc. | added 7/79; 1/80; eliminated 4/90 | | NRHS |
| 1007 | IFBX | General Electric Railcar Services Corp. | added 4/90; 1/94; eliminated 1/2000 | | NRHS |
| 1008 | IFBX | General Electric Rail Services Corp. | added 1/2000; 7/2000 | | NRHS |
| 1009 | IFBX | (NATX) G. E. RAIL SERVICES [INDIANA FARM BUREAU C0-0P ASSOC.] | | | PWRC |
| 1010 | IFBX | Indiana Farm Bureau Cooperative Association (GE Rail Services Corporation) | | | RSRV |
| 1011 | IFBX | GENERAL ELECTRIC RAILCAR SERVICES C | | | SCAC4 |
| 1012 | IFC | Indian Air Force | Callsign: Indian Air Force, | IND | AVCODES |
| 1013 | IFC | Indian Air Force | | | ICAO1 |
| 1014 | IFCB | INTERSTATE FREIGHT CARRIERS INC | | | SCAC4 |
| 1015 | IFCF | I F C INTERNATIONAL FREIGHT CORP | | | SCAC4 |
| 1016 | IFCH | INTERFRACHT CONTAINER OVERSEAS SERV | | | SCAC4 |
| 1017 | IFCI | IMPORTERS FORWARDING COMPANY INC | | | SCAC4 |
| 1018 | IFCL | INTEGRA FUEL CO LTD | | | SCAC4 |
| 1019 | IFCX | Interstate Foods Corp. | added 10/1982; 1/1994; eliminated 10/1994; 7/2000-7/2005 (not listed) | | NAKINA |
| 1020 | IFCX | Interstate Foods Corp. | added 10/82; 1/94; eliminated 10/94; 7/2000 | | NRHS |
| 1021 | IFCX | INTERSTATE FOODS CORPORATION | | | PWRC |
| 1022 | IFCX | Interstate Foods Corporation | | | RSRV |
| 1023 | IFCX | INTERSTATE FOODS CORPORATION | | | SCAC4 |
| 1024 | IFDU | INTERNATIONAL FREIGHT DRONE INC. | | USA | BIC |
| 1025 | IFEA | KP Elektroavtotrans Ivano-Frankivsk | City: Ivano-Frankivsk | UA | TRAFFIC |
| 1026 | IFEH | INTERNATIONAL FREIGHT EXPRESS (HK) | | | SCAC4 |
| 1027 | IFES | I F EXPRESS | | | SCAC4 |
| 1028 | IFF | Interfreight Forwarding Ltd. | Callsign: Interfreighter, | SUD | AVCODES |
| 1029 | IFF | Interfreight Forwarding | | | ICAO1 |
| 1030 | IFFE | I-44 EXPRESS INC | | | SCAC4 |
| 1031 | IFFG | INTEGRITY FAST FREIGHT | | | SCAC4 |
| 1032 | IFFH | INTERNATIONAL FREIGHT FORWARD | | | SCAC4 |
| 1033 | IFFN | INGRAHAMS FARM LTD | | | SCAC4 |
| 1034 | IFFS | IFL INTERNATIONAL FREIGHT LINES LIM | | | SCAC4 |
| 1035 | IFFU | DEN HARTOGH DRY BULK LOGISTICS LTD | | GB | BIC |
| 1036 | IFFU | U B C LTD | | | SCAC4 |
| 1037 | IFG | Infinity Flight Group | Callsign: Infinity, | USA | AVCODES |
| 1038 | IFGF | IDS FREIGHT SERVICES USA LLC | | | SCAC4 |
| 1039 | IFGG | INDIGO FG & G INC | | | SCAC4 |
| 1040 | IFGH | ILLINOIS FREIGHT INC | | | SCAC4 |
| 1041 | IFGL | INTERNATIONAL FREIGHT & LOGISTICS I | | | SCAC4 |
| 1042 | IFGN | IDS FREIGHT SERVICES USA LLC | | | SCAC4 |
| 1043 | IFGO | INTELLISHIP FREIGHT SOLUTIONS | | | SCAC4 |
| 1044 | IFHL | IHAUL FREIGHT LTD | | | SCAC4 |
| 1045 | IFHR | INTERNATIONAL FREIGHT HANDLERS LLC | | | SCAC4 |
| 1046 | IFI | Air Lift A.A.E. | Callsign: Hellas Lift, Name changed from Hyperion S.A. ICAO callsign changed | GR | AVCODES |
| 1047 | IFI | Hyperion, S.A. | Callsign: Hyperion, Name changed to Air Lift A.A.E. | GR | AVCODES |
| 1048 | IFI | Air Lift | | | ICAO1 |
| 1049 | IFIG | INTERSTATE FLEET INC | | | SCAC4 |
| 1050 | IFIT | INTEGRATED FIXTURES | | | SCAC4 |
| 1051 | IFIY | INFINITY EXPRESS INC | | | SCAC4 |
| 1052 | IFJC | IBARRA FLORES, JOSE CIRILO & JOSE A | | | SCAC4 |
| 1053 | IFJT | IFJ TRUCKING | | | SCAC4 |
| 1054 | IFKO | IFKO, FRANK JR INC | | | SCAC4 |
| 1055 | IFL | IFL Group, Inc. | Callsign: Eifel, | USA | AVCODES |
| 1056 | IFL | Interflug Gesellschaft Fur Internationalen Flugverkehr mbH | IATA: IF, Callsign: Interflug, Liquidated on 07 February 1991. Last operation 30 April 1991. | DDR | AVCODES |
| 1057 | IFL | IFL Group | | | ICAO1 |
| 1058 | IFLA | INFINITI FREIGHT LOGISTICS INC | | | SCAC4 |
| 1059 | IFLC | INTER FLORIDA CONTAINER TRANSPORT I | | | SCAC4 |
| 1060 | IFLF | INTERNATIONAL FASTLINE FORWARDING I | | | SCAC4 |
| 1061 | IFLG | IFL GROUP INC | | | SCAC4 |
| 1062 | IFLI | INTERNATIONAL FREIGHT LOGISTICS (US | | | SCAC4 |
| 1063 | IFLL | INTERSTATE FURNITURE LOGISTICS LLC | | | SCAC4 |
| 1064 | IFLN | IFLN SHIPPING LINE | | | SCAC4 |
| 1065 | IFLT | INFLIGHT EXPRESS INC | | | SCAC4 |
| 1066 | IFLU | NRS OCEAN LOGISTICS LTD. | | GB | BIC |
| 1067 | IFLU | INTERFLOW | | | PWRC |
| 1068 | IFLU | Interflow | | | RSRV |
| 1069 | IFLU | INTERFLOW TANK CONTAINER SYSTEM LTD | | | SCAC4 |
| 1070 | IFLUG | Interflug | | DDR | TRAFFIC |
| 1071 | IFLW | INTERFLOW USA INC | | | SCAC4 |
| 1072 | IFM | iFly S.A. | Callsign: Icopter, | GR | AVCODES |
| 1073 | IFM | IFM/GRACE COACH LINES INC | | | SCAC4 |
| 1074 | IFME | INFINIUM ENTERPRISES INC | | | SCAC4 |
| 1075 | IFMS | INFINITY MOVING & STORAGE INC | | | SCAC4 |
| 1076 | IFMU | INFINITI MARINE PTE LTD | | SGP | BIC |
| 1077 | IFNY | IFS (NY) INC | | | SCAC4 |
| 1078 | IFOC | INDIANA FUEL & OIL CO | | | SCAC4 |
| 1079 | IFOI | INDUSTRIAL CONTAINER SERVICES CO LL | | | SCAC4 |
| 1080 | IFOX | Jeffrey J. Kelling | added 1/1987; eliminated 7/1989 | | NAKINA |
| 1081 | IFOX | Industrial Fuel Oil, Inc. | added 1/1981; eliminated 1/1987 | | NAKINA |
| 1082 | IFOX | Industrial Fuel Oil, Inc. | added 1/81; eliminated 1/87 | | NRHS |
| 1083 | IFOX | Jeffrey J. Kelling | added 1/87; eliminated 7/89 | | NRHS |
| 1084 | IFOX | *INDUSTRIAL FUEL OIL, INC. | | | PWRC |
| 1085 | IFOX | *JEFFREY J. KELLING | | | PWRC |
| 1086 | IFOX | Industrial Fuel Oil | | | RSRV |
| 1087 | IFPD | INNOVATIVE FISHERY PRODUCTS INC | | | SCAC4 |
| 1088 | IFPL | IPPOLITO TRANSPORTATION INC | | | SCAC4 |
| 1089 | IFPU | INTEROCEAN LINES LTD | | | SCAC4 |
| 1090 | IFR | International Flight Resources, LLC | | USA | AVCODES |
| 1091 | IFRA | INDUSTRIAL FIELD ROBOTICS USA INC | | | SCAC4 |
| 1092 | IFRF | INTERNATIONAL FREIGHT FORWARDING | | | SCAC4 |
| 1093 | IFRH | INDIANA FREIGHT SERVICE INC II | | | SCAC4 |
| 1094 | IFRIG | Interfrigo | | D | TRAFFIC |
| 1095 | IFRN | IN2 FR8 | | | SCAC4 |
| 1096 | IFRQ | INTEROCEAN FREIGHT SERVICES SDN BHD | | | SCAC4 |
| 1097 | IFRU | INFRABUILD | | AUS | BIC |
| 1098 | IFRX | Infinity Rail, LLC | 7/2005 (not listed) | | NAKINA |
| 1099 | IFRX | INFINITY RAIL, LLC | | | PWRC |
| 1100 | IFRX | Infinity Rail | | | RSRV |
