| 1 | RSN | Royal Swazi National Airways Corp. | IATA: ZC, Callsign: Swazi National, IATA Prefix: 141, Designator ZC recalled by IATA | SD | AVCODES |
| 2 | RSN | Royal Swazi National Airways | | | ICAO1 |
| 3 | RSNA | ROSSANA VAN LINES | | | SCAC3 |
| 4 | RSNC | ROBERTS & SONS CARTAGE CO | | | SCAC3 |
| 5 | RSNC | RS TRANSFER SA DE CV | | | SCAC4 |
| 6 | RSNE | RESNER, PHIL TRUCKING | | | SCAC4 |
| 7 | RSNF | ROSEN FORWARDERS INC | | | SCAC3 |
| 8 | RSNG | ROSSING TRUCK CO | | | SCAC3 |
| 9 | RSNI | READS MOVING SYSTEMS OF NORFOLK INC | | | SCAC4 |
| 10 | RSNJ | ROSENO TRUCKING | | | SCAC4 |
| 11 | RSNK | RED SUN TRANSPORT CO | | | SCAC4 |
| 12 | RSNM | RESENDES | | | SCAC4 |
| 13 | RSNN | ROBISON & SONS DAIRY | | | SCAC4 |
| 14 | RSNO | ROSIN TRANSPORT | | | SCAC4 |
| 15 | RSNR | Red Springs and Northern R.R. Co. | added 1/1985; 1/1994; eliminated 7/1996; 7/2000-7/2005 | | NAKINA |
| 16 | RSNR | Red Springs and Northern R.R. Co. | added 1/85; 1/94; eliminated 7/96; 7/2000 | | NRHS |
| 17 | RSNR | RED SPRINGS & NORTHERN RAILROAD CO. | | | PWRC |
| 18 | RSNR | Red Springs and Northern Railroad | | | RSRV |
| 19 | RSNR | RED SPRINGS NORTHERN RAILROAD CO | | | SCAC3 |
| 20 | RSNS | RISING STAR TRANSPORTATION INC | | | SCAC4 |
| 21 | RSNV | RED SPIRIT NAVIGATION LIMITED, MALT | | | SCAC4 |
| 22 | RSNX | Railrunner N.A., Inc. | added 1/2004 | | NAKINA |
| 23 | RSNX | RAILRUNNER N.A., INC. | | | PWRC |
| 24 | RSNY | REPUBLIC STEEL (NEW YORK) | | | PWRC |
| 25 | RSNY | RAVENSCROFT SHIPPING INC, NY | | | SCAC3 |
| 26 | RSNY | RAVENSCROFT SHIP MANAGEMENT INC | | | SCAC4 |
