Real world company prefixes

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I& I2 I3 I4 I5 I6 I7 I8 I9 IA IB IC ID IE IF IG IH II IJ IK IL IM IN IO IP IQ IR IS IT IU IV IW IX IY IZ
ISA ISB ISC ISD ISE ISF ISG ISH ISI ISK ISL ISM ISN ISO ISP ISR ISS IST ISU ISV ISW ISX ISY
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1 IS Island Airlines, Inc. ICAO: ISA, Callsign: Island, USA AVCODES
2 IS IDS Aircraft Ltd. d/b/a I.D.S. Heathrow Exective Jets ICAO: IDS, Callsign: Fanjet, Name changed from IDS Aircraft Ltd. GB AVCODES
3 IS Intercontinental Pacific Airways, Inc. ICAO: IPC, Callsign: Interpac, IATA designator changed to IO RP AVCODES
4 IS IDS Aircraft Ltd. ICAO: IDS, Callsign: IDS, Name changed to IDS Aircraft Ltd. d/b/a I.D.S. Heathrow Exective Jets GB AVCODES
5 IS AIS Airlines B.V. ICAO: PNX, Callsign: Spinner, NL AVCODES
6 IS Sepehran Airlines ICAO: SHI, Callsign: Shirazi, IR AVCODES
7 ISA Island Airlines, Inc. IATA: IS, Callsign: Island, USA AVCODES
8 ISA Island Air Callsign: Island, USA AVCODES
9 ISAA ISAACS MOVING & STORAGE     SCAC4
10 ISAE ISAAC, LEON     SCAC4
11 ISAF ISLAND SUPERIOR AIR FILTERS     SCAC4
12 ISAF ISAF S.A.   RO TRAFFIC
13 ISAF ISAF SA   RO VKM
14 ISAH IONICS MASS SPECTROMETRY GROUP INC     SCAC4
15 ISAM ISAM S.r.l.   IT VKM
16 ISAN INLAND STATE AIR ENTERPRISES INC     SCAC4
17 ISAP INTERNATIONAL SEA & AIR SHIPPING     SCAC4
18 ISAR ISARIC TRANSPORT INC     SCAC4
19 ISAR Isarperle   D TRAFFIC
20 ISAU NORDIC BULKERS AB     SCAC4
21 ISAW INLACO SAIGON     SCAC4
22 ISAY INTERNATIONAL SHIPPING AND LOGISTIC     SCAC4
23 ISB Caraibes Air Transport IATA: WS, Callsign: Island Bird, Designator WS recalled by IATA GP AVCODES
24 ISBC INTEQUIP MINING SALES & SERVICES LT     SCAC4
25 ISBL ISABELLA SHIPOWNER S A     SCAC4
26 ISBU SEABOARD SYSTEM RAILROAD     SCAC4
27 ISC Island Air Charters, Inc. Callsign: Barracuda, USA AVCODES
28 ISC Interporto Servizio Cargo   I TRAFFIC
29 ISC ISC-INTERPORTO Servizi Cargo S.P.A.   IT VKM
30 ISCB ISABELLA SHIPPING COMPANY     SCAC1
31 ISCB ISABELLA SHIPPING COMPANY LTD BERMU     SCAC4
32 ISCC INTERNATIONAL SHIPPING COMPANY INC.     SCAC4
33 ISCF INTERNATIONAL STONE CONCEPTS     SCAC4
34 ISCG INDUSTRIAL SERVICES CONTRACTORS INC     SCAC4
35 ISCI INTERNATIONAL TRANSPORT EXPRESS COR     SCAC4
36 ISCL INDIA STEAMSHIP (A DIV OF     SCAC4
37 ISCO INTERMODAL SALES CORPORATION     SCAC4
38 ISCP INSTRON CORP     SCAC4
39 ISCQ INTEGRITY SHIPPING CORP     SCAC4
40 ISCR INLAND SEAFOOD CORP     SCAC4
41 ISCT INTRINSIC TRANSPORT INC     SCAC4
42 ISCU STAR CONTAINER SPAIN S.A.   E BIC
43 ISCU I.S.C. CHEMICALS LTD.     PWRC
44 ISCU I.S.C. Chemicals     RSRV
45 ISCX ISC, Inc. 1/1994-7/2005   NAKINA
46 ISCX Interlake, Inc. added 4/1971; 1/1975; eliminated 7/1976   NAKINA
47 ISCX Interlake Steel Corp. added 7/1965 (reporting marks changed from IICX); 7/1965-10/1966; eliminated 10/1967   NAKINA
48 ISCX International Sugar Co. eliminated 10/1960   NAKINA
49 ISCX Imperial Sugar Co. added 7/1960   NAKINA
50 ISCX Carnegie-Illinois Steel Corp. 7/1937-4/1938   NAKINA
51 ISCX Illinois Steel Co. 7/1935   NAKINA
52 ISCX Illinois Steel Co. Tank Line 8/1920-7/1932   NAKINA
53 ISCX Illinois Steel Co. (Carnegie-Illinois Steel Corp.) Apr-38   NRHS
54 ISCX Imperial Sugar Co. added 7/60   NRHS
55 ISCX International Sugar Co. eliminated 10/60   NRHS
56 ISCX Interlake Steel Corp. added 7/65 (reporting marks changed from IICX); 7/65-10/66; eliminated 10/67   NRHS
57 ISCX Interlake, Inc. added 4/71; 1/75; eliminated 7/76   NRHS
58 ISCX ISC, Inc. 1/94-7/2000   NRHS
59 ISCX *CARNEGIE-ILLINOIS STEEL CORP. [ILLINOIS STEEL CO. TANK LINE]     PWRC
60 ISCX *INTERNATIONAL SUGAR CO. [IMPERIAL SUGAR CO.]     PWRC
61 ISCX *INTERLAKE, INC. [INTERLAKE STEEL CORP.]     PWRC
62 ISCX +ISC, INC.     PWRC
63 ISCX Illinois Steel Company (ISC Inc.)     RSRV
64 ISCX ISC INC     SCAC4
65 ISD ISD Avia Ltd. Callsign: Isdavia, UA AVCODES
66 ISD Innovative Software Design   ZA AVCODES
67 ISD ISD Avia     ICAO1
68 ISDE IRONSIDE ENTERPRISES INC     SCAC4
69 ISDO INSIDEOUT ART     SCAC4
70 ISDU ISRO DEPARTMENT OF SPACE GOVT OF INDIA   IND BIC
71 ISE Ise Electric Railway Co. Owned by Kintetsu J TRAFFIC
72 ISER Ise Railway 3. sector railway in Mie Prefecture J TRAFFIC
73 ISES ISLAND ENTERPRISES     SCAC4
74 ISEU I C E SERVICE GROUP INC     SCAC4
75 ISF International Stabilisation Assistance Force Afghanistan Peace keeping forces GB AVCODES
76 ISF International Sabilisation Assistance Force     ICAO1
77 ISFD ISF TRADING INC     SCAC4
78 ISFF INTERSCAN SCHIFFAHRTSGESELLSCHAFT M     SCAC4
79 ISFN ICICLE SEAFOODS INC     SCAC4
80 ISFR ISAAC FREIGHT LIMITED     SCAC4
81 ISFX International Sugar Feed Co. 8/1920-7/1923   NAKINA
82 ISFX INTERNATIONAL SUGAR FEED CO.     PWRC
83 ISFZ SEACASTLE CHASSIS     SCAC4
84 ISG Sixcargo S.p.A. IATA: 6P, Callsign: Italcargo, Name changed to Clubair Sixgo S.p.A. I AVCODES
85 ISG Clubair Sixgo S.p.A. IATA: 6P, Callsign: Italcargo, Name changed from Sixcargo S.p.A. I AVCODES
86 ISG Club Air IATA: 6P   ICAO1
87 ISG ISG RAILWAYS     PWRC
88 ISG ISG Railways     RSRV
89 ISGE ISG EXPRESS INC     SCAC4
90 ISGI INTERSTATE SERVICE GROUP INC     SCAC4
91 ISGL INTERMODAL SOLUTIONS GROUP LLC     SCAC4
92 ISGT ISG TRANSPORTATION INC     SCAC4
93 ISGU INCHCAPE SHIPPING SERVICE     SCAC4
94 ISGX International Steel Group d/b/a ISG Burns Harbor, Inc. 7/2005 (not listed)   NAKINA
95 ISGX INTERNATIONAL STEEL GROUP d/b/a ISG BURNS HARBOR, INC.     PWRC
96 ISGX INTERNATIONAL STEEL GROUP D/B/A ISG     SCAC4
97 ISH Island Winds, Inc. Callsign: Island Hop, USA AVCODES
98 ISHI INTER SHIP INC     SCAC4
99 ISHN INKEL, STEPHANE INC     SCAC4
100 ISHU ISLAND SHIPPING LINE LTD.     SCAC4
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