| 1 | ISW | Serib Wings | Callsign: Serib, Ceased operations | I | AVCODES |
| 2 | ISW | Islas Airways | IATA: IF, Callsign: Pintadera, IATA Prefix: 769, Founded in 2002. Commenced operations in February 2003. Ceased operations on 15 October 2012. Designator IF reinstated by IATA | E | AVCODES |
| 3 | ISW | Islas Airways | IATA: IF | | ICAO1 |
| 4 | ISW | Indiana Southwestern Ry. Co. | 7/2000-7/2005 | | NAKINA |
| 5 | ISW | Indiana Southwestern Ry. Co. | Jul-00 | | NRHS |
| 6 | ISW | INDIANA SOUTHWESTERN RWY. CO. | | | PWRC |
| 7 | ISW | Indiana Southwestern Railway | | | RSRV |
| 8 | ISW | INDIANA SOUTHWESTERN RAILWAY CO | | | SCAC4 |
| 9 | ISWC | INTERNATIONAL SPEEDWAY CORPORATION | | | SCAC4 |
| 10 | ISWF | IT'S WORTH FRAMING | | | SCAC4 |
| 11 | ISWN | ISEWAN U S A INC | | | SCAC4 |
| 12 | ISWX | RAILSYNC - CONCUR | | | SCAC4 |
