| 1 | RLS | Riga Aeronatical Institute | Callsign: Riga Institutwe, | LV | AVCODES |
| 2 | RLS | S-Air, Private Joint-Stock Aviation Company | Callsign: S-Airlines, | RUS | AVCODES |
| 3 | RLS | S-Air | | | ICAO1 |
| 4 | RLSA | ROLLS AROUND TOWN LIMOUSINE SERVICE | | | SCAC3 |
| 5 | RLSB | RLS DISRIBUTION INC | | | SCAC4 |
| 6 | RLSC | REFRIGERACION LOZANO SA DE CV | | | SCAC4 |
| 7 | RLSD | REFRIGERADOS LOGRA SA DE CV | | | SCAC4 |
| 8 | RLSE | ROBINSONS LOBSTER BAIT | | | SCAC4 |
| 9 | RLSF | ROAD LOGISTICS SOLUTIONS INC | | | SCAC4 |
| 10 | RLSG | RLS | | | SCAC4 |
| 11 | RLSH | RELIABLE SHIPPERS INC | | | SCAC3 |
| 12 | RLSI | ROSE LIMOUSINE SERVICE INC, THE | | | SCAC4 |
| 13 | RLSL | RONALD LIMOUSINE SERVICE LTD | | | SCAC3 |
| 14 | RLSN | RAL-SAN TRANSPORT CO INC | | | SCAC3 |
| 15 | RLSN | R L S INTERNATIONAL T | | | SCAC4 |
| 16 | RLSP | ROYAL LIMOUSINE SERVICE OF PRINCETO | | | SCAC3 |
| 17 | RLSP | RLS CORP | | | SCAC4 |
| 18 | RLSQ | RAYLS BROTHERS TRANSFER INC | | | SCAC3 |
| 19 | RLSR | REIMER, LESTER TRUCKING LTD | | | SCAC3 |
| 20 | RLSR | REIMER, LESTER TRUCKING LTD | | | SCAC4 |
| 21 | RLSS | RELOCATION SYSTEMS INC | | | SCAC3 |
| 22 | RLSS | RANCHO LOS SOLORIOS | | | SCAC4 |
| 23 | RLSU | RR SHIPPING PRIVATE LIMITED | | IND | BIC |
| 24 | RLSU | RAFFLES LEASE PTE LTD | | | SCAC4 |
| 25 | RLSV | ROYALTY LIMOUSINE SERVICE INC | | | SCAC3 |
| 26 | RLSX | Robert L. Shipp | added 10/1983; eliminated 1/1990 | | NAKINA |
| 27 | RLSX | Robert L. Shipp | added 10/83; eliminated 1/90 | | NRHS |
| 28 | RLSX | ROBERT L. SHIPP | | | PWRC |
| 29 | RLSX | Robert L. Shipp | | | RSRV |
| 30 | RLSX | ROBERT L. SHIPP | | | SCAC4 |
| 31 | RLSY | ROADWAY LOGISTICS SYSTEMS INC | | | SCAC3 |
| 32 | RLSY | RLS | | | SCAC4 |
| 33 | RLSZ | REDLINE STONE | | | PWRC |
