| 8601 | RSN | Royal Swazi National Airways | | | ICAO1 |
| 8602 | RSNA | ROSSANA VAN LINES | | | SCAC3 |
| 8603 | RSNC | ROBERTS & SONS CARTAGE CO | | | SCAC3 |
| 8604 | RSNC | RS TRANSFER SA DE CV | | | SCAC4 |
| 8605 | RSNE | RESNER, PHIL TRUCKING | | | SCAC4 |
| 8606 | RSNF | ROSEN FORWARDERS INC | | | SCAC3 |
| 8607 | RSNG | ROSSING TRUCK CO | | | SCAC3 |
| 8608 | RSNI | READS MOVING SYSTEMS OF NORFOLK INC | | | SCAC4 |
| 8609 | RSNJ | ROSENO TRUCKING | | | SCAC4 |
| 8610 | RSNK | RED SUN TRANSPORT CO | | | SCAC4 |
| 8611 | RSNM | RESENDES | | | SCAC4 |
| 8612 | RSNN | ROBISON & SONS DAIRY | | | SCAC4 |
| 8613 | RSNO | ROSIN TRANSPORT | | | SCAC4 |
| 8614 | RSNR | Red Springs and Northern R.R. Co. | added 1/1985; 1/1994; eliminated 7/1996; 7/2000-7/2005 | | NAKINA |
| 8615 | RSNR | Red Springs and Northern R.R. Co. | added 1/85; 1/94; eliminated 7/96; 7/2000 | | NRHS |
| 8616 | RSNR | RED SPRINGS & NORTHERN RAILROAD CO. | | | PWRC |
| 8617 | RSNR | Red Springs and Northern Railroad | | | RSRV |
| 8618 | RSNR | RED SPRINGS NORTHERN RAILROAD CO | | | SCAC3 |
| 8619 | RSNS | RISING STAR TRANSPORTATION INC | | | SCAC4 |
| 8620 | RSNV | RED SPIRIT NAVIGATION LIMITED, MALT | | | SCAC4 |
| 8621 | RSNX | Railrunner N.A., Inc. | added 1/2004 | | NAKINA |
| 8622 | RSNX | RAILRUNNER N.A., INC. | | | PWRC |
| 8623 | RSNY | REPUBLIC STEEL (NEW YORK) | | | PWRC |
| 8624 | RSNY | RAVENSCROFT SHIPPING INC, NY | | | SCAC3 |
| 8625 | RSNY | RAVENSCROFT SHIP MANAGEMENT INC | | | SCAC4 |
| 8626 | RSO | Aero Asia International (Private) Ltd. | IATA: E4, Callsign: Aero Asia, IATA Prefix: 532, | PK | AVCODES |
| 8627 | RSO | Aero Asia International | IATA: E4 | | ICAO1 |
| 8628 | RSOA | R S OIL CORPORATION | | | SCAC4 |
| 8629 | RSOC | RSO INC | | | SCAC3 |
| 8630 | RSOD | RESOURCE DISTRIBUTION INC | | | SCAC3 |
| 8631 | RSOG | RUSSOM TRUCKING INC | | | SCAC4 |
| 8632 | RSOI | RIVERSIDE OIL INC | | | SCAC3 |
| 8633 | RSOL | RESEARCH SOLVENTS AND CHEMICALS INC | | | SCAC4 |
| 8634 | RSOM | ROSS OIL CO INC | | | SCAC4 |
| 8635 | RSOP | ROSE OF SHARON TRANSPORTATION LLC | | | SCAC4 |
| 8636 | RSOR | Riceboro Southern Ry., LLC | added 1/2005; 7/2005; eliminated 7/2006 | | NAKINA |
| 8637 | RSOR | RICEBORO SOUTHERN RAILWAY | | | PWRC |
| 8638 | RSOR | Riceboro Southern Railway | | | RSRV |
| 8639 | RSOR | RICEBORO SOUTHERN RAILWAY LLC | | | SCAC4 |
| 8640 | RSOT | RUSSO TRUCKING INC | | | SCAC4 |
| 8641 | RSOX | General Electric Rail Services Corp. | added 10/2001; 7/2005 | | NAKINA |
| 8642 | RSOX | Resolution Performance Products | added 4/2001; eliminated 10/2001 | | NAKINA |
| 8643 | RSOX | Shell Epoxy Resins | added 1/2001; eliminated 4/2001 | | NAKINA |
| 8644 | RSOX | Shell Epoxy Resins | added 1/2001; eliminated 4/2001 | | NRHS |
| 8645 | RSOX | Resolution Performance Products | added 4/2001 | | NRHS |
| 8646 | RSOX | *RESOLUTION PERFORMANCE PRODUCTS [SHELL EPOXY RESINS] | | | PWRC |
| 8647 | RSOX | +GENERAL ELECTRIC RAIL SERVICES CORP.) | | | PWRC |
| 8648 | RSOX | General Electric Rail Services Corporation | | | RSRV |
| 8649 | RSOX | GENERAL ELECTRIC RAILCAR SERVICES C | | | SCAC4 |
| 8650 | RSP | Raspet Flight Research Laboratory | Callsign: Raspet, | USA | AVCODES |
| 8651 | RSP | Superior Air Charter, LLC d/b/a Jetsuite Air | Callsign: Red Stripe, | USA | AVCODES |
| 8652 | RSP | Roscoe, Snyder & Pacific Ry. | 7/1965-10/1966 | | NAKINA |
| 8653 | RSP | Roscoe, Snyder and Pacific Ry. Co. | 1/1994-7/2005 | | NAKINA |
| 8654 | RSP | Roscoe, Snyder & Pacific Ry. | 4/1961 & 4/1970-1/1980; eliminated 1/1989; eliminated 4/1989 | | NAKINA |
| 8655 | RSP | Roscoe, Snyder & Pacific Ry. | 4/61 & 4/70-1/80; eliminated 1/89; eliminated 4/89 | | NRHS |
| 8656 | RSP | Roscoe, Snyder and Pacific Ry. Co. | 1/94-7/2000 | | NRHS |
| 8657 | RSP | Roscoe, Snyder & Pacific Ry. | 7/65-10/66 | | NRHS |
| 8658 | RSP | ROSCOE, SNYDER & PACIFIC RAILWAY CO. | | | PWRC |
| 8659 | RSP | Roscoe, Snyder and Pacific Railway | | | RSRV |
| 8660 | RSPA | RAVENNAVI SPA | | | SCAC3 |
| 8661 | RSPA | RAILSIDE SPORTS & MARINE | | | SCAC4 |
| 8662 | RSPB | REDEARTH SPIRIT | | | SCAC4 |
| 8663 | RSPC | RISINGER BROS TRANSFER INC | | | SCAC4 |
| 8664 | RSPE | ROSSINI SPECIALTIES LTD | | | SCAC3 |
| 8665 | RSPG | RICHOCEAN SHIPPING AGENCY SA HONG K | | | SCAC3 |
| 8666 | RSPI | R/S TRANSPORT INC | | | SCAC3 |
| 8667 | RSPL | RONDEL SHIPPING LTD | | | SCAC3 |
| 8668 | RSPL | RED STAR PETROLEUM LLC | | | SCAC4 |
| 8669 | RSPM | ROSS PETROLEUM INC | | | SCAC4 |
| 8670 | RSPN | R & S TRANSPORTATON | | | SCAC3 |
| 8671 | RSPO | R & S TRANSPORTATION | | | SCAC3 |
| 8672 | RSPO | R & S TRANSPORTATION INC | | | SCAC4 |
| 8673 | RSPR | R & S TRANSPORT | | | SCAC3 |
| 8674 | RSPR | ROLLE, S P TRUCKING | | | SCAC4 |
| 8675 | RSPS | R S P EXPRESS INC | | | SCAC4 |
| 8676 | RSPT | R S TRANSPORTATION | | | SCAC3 |
| 8677 | RSPX | General Electric Railcar Services Corp. | added 10/1992; 1/1994; eliminated 10/1994 | | NAKINA |
| 8678 | RSPX | Itel Rail Corp. | added 4/1988; eliminated 10/1992 | | NAKINA |
| 8679 | RSPX | Evans Railcar Leasing Co. | added 10/1980; eliminated 4/1988 | | NAKINA |
| 8680 | RSPX | United States Railway Leasing Co. | 1/1980; eliminated 10/1980 | | NAKINA |
| 8681 | RSPX | United States Leasing Co. | added 7/1979 | | NAKINA |
| 8682 | RSPX | United States Railway Equipment Co. | added 7/1970; 1/1975; eliminated 7/1979 | | NAKINA |
| 8683 | RSPX | United States Railway Leasing Co. | added 4/1970; 4/1970; eliminated 7/1970 | | NAKINA |
| 8684 | RSPX | RSP Car Co. | added 7/1960; 4/1961-10/1966; eliminated 4/1970 | | NAKINA |
| 8685 | RSPX | RSP Car Co. | added 7/60; 4/61-10/66; eliminated 4/70 | | NRHS |
| 8686 | RSPX | United States Railway Leasing Co. | added 4/70; 4/70; eliminated 7/70 | | NRHS |
| 8687 | RSPX | United States Railway Equipment Co. | added 7/70; 1/75; eliminated 7/79 | | NRHS |
| 8688 | RSPX | United States Leasing Co. | added 7/79 | | NRHS |
| 8689 | RSPX | United States Railway Leasing Co. | 1/80; eliminated 10/80 | | NRHS |
| 8690 | RSPX | Evans Railcar Leasing Co. | added 10/80; eliminated 4/88 | | NRHS |
| 8691 | RSPX | Itel Rail Corp. | added 4/88; eliminated 10/92 | | NRHS |
| 8692 | RSPX | General Electric Railcar Services Corp. | added 10/92; 1/94; eliminated 10/94 | | NRHS |
| 8693 | RSPX | (NATX) GEN. ELECTRIC RAILCAR SERVICES CORP. [ITEL RAIL CORP.; EVANS RAILCAR LEASING CO.; U.S. RAILWAY LEASING CO.; RSP CAR CO.] | | | PWRC |
| 8694 | RSPX | Evans Railcar Leasing (GE Railcar Services) | | | RSRV |
| 8695 | RSPX | RSP CAR CO | | | SCAC3 |
| 8696 | RSPZ | TRANSAMERICA LEASING INC [(REAZ) SOUTHERN PACIFIC TRANSP CO] | | | PWRC |
| 8697 | RSPZ | TAL International (Union Pacific) | | | RSRV |
| 8698 | RSPZ | TRANSAMERICA LEASING INC | | | SCAC4 |
| 8699 | RSQ | International SOS Windhoek | Callsign: Skymedic, | NAM | AVCODES |
| 8700 | RSQ | International SOS WIndhoek | | | ICAO1 |
