| 1 | RSY | The Airline iFly | IATA: H5, Callsign: Russian Sky, Designator H5 recalled by IATA | RUS | AVCODES |
| 2 | RSY | The Airline iFly | IATA: I4, Callsign: Russian Sky, IATA designator changed to F7. Designator H5 recalled by IATA | RUS | AVCODES |
| 3 | RSY | The Airline iFly | IATA: F7, Callsign: Russian Sky, IATA designator changed from I4*. Designator H5 recalled by IATA | RUS | AVCODES |
| 4 | RSYI | RTS DELIVERY INC | | | SCAC4 |
| 5 | RSYM | ROTH, SYLVESTER M | | | SCAC3 |
| 6 | RSYN | ROGERS SPRAYERS INC | | | SCAC4 |
| 7 | RSYS | ROYCE SYSTEMS/SERVICES INC | | | SCAC3 |
| 8 | RSYT | R S T INC | | | SCAC3 |
| 9 | RSYX | Refined Sugars, Inc. | added 7/1981; eliminated 10/1986; 1/1994-7/2005 (not listed) | | NAKINA |
| 10 | RSYX | Refined Syrups & Sugars, Inc. | added 7/1980; eliminated 7/1981 | | NAKINA |
| 11 | RSYX | Refined Syrups & Sugars, Inc. | added 7/80; eliminated 7/81 | | NRHS |
| 12 | RSYX | Refined Sugars, Inc. | added 7/81; eliminated 10/86; 1/94-7/2000 | | NRHS |
| 13 | RSYX | REFINED SUGARS INC. | | | PWRC |
| 14 | RSYX | Refined Sugars | | | RSRV |
| 15 | RSYX | REFINED SUGARS INC. | | | SCAC4 |
