| 1 | RN | Euralair International | ICAO: EUL, Callsign: Euralair, ICAO designator change to ERL. Designator RN reinstated by IATA | F | AVCODES |
| 2 | RN | Sum Air Services, Inc. | | USA | AVCODES |
| 3 | RN | Euralair Horizons | ICAO: EUL, Callsign: Euralair, ICAO Designator changed to EUH. Name changed from Euralair International. Designator RN reinstated by IATA | F | AVCODES |
| 4 | RN | Euralair Horizons | ICAO: EUH, Callsign: Euralair Horizons, Name changed to Air Horizons | F | AVCODES |
| 5 | RN | Air Horizons | ICAO: EUH, Callsign: Euralair Horizons, Ceased operations during November 2005. Name changed from Euralair Horizons | F | AVCODES |
| 6 | RN | Aeronexus Corporate Pty Ltd | ICAO: ARN, Callsign: Aeronex, IATA Prefix: 557, | ZA | AVCODES |
| 7 | RN | Rayani Air Sdn. Bhd. | ICAO: RKT, Callsign: Blue Green, IATA Prefix: 639, Founded on 19 January 2015. Commenced operations on 20 December 2015. Ceased operations on 13 June 2016. | T | AVCODES |
| 8 | RN | Air Pohang Co., Ltd. | ICAO: KAB, Callsign: Air Pohang, Commenced operations on 07 February 2018. Ceased operations on 29 November 2018. | ROK | AVCODES |
| 9 | RN | Royal Eswatini National Airways Corporation | ICAO: SZL, Callsign: Eswatini, | SD | AVCODES |
| 10 | RN | Railion Nederland | | NL | VKM |
| 11 | RNA | Nepal Airlines Corporation t/a Royal Nepal Airlines | IATA: RA, Callsign: Royal Nepal, IATA Prefix: 285, Name changed to Nepal Airlines Corporation. Founded on 01 July 1958. Designator RA reinstated by IATA | NEP | AVCODES |
| 12 | RNA | Nepal Airlines Corporation t/a Nepal Airlines | IATA: RA, Callsign: Royal Nepal, IATA Prefix: 285, Name changed from Royal Nepal Airlines Corporation. Founded in 1958. Designator RA reinstated by IATA | NEP | AVCODES |
| 13 | RNA | Nepal Airlines | IATA: RA | | ICAO1 |
| 14 | RNA | Royal Nepal Airlines | IATA: RA | | ICAO1 |
| 15 | RNA | RIPLEY & NEW ALBANY RAILROAD COMPAN | | | SCAC4 |
| 16 | RNA | Rhein-Meckar Air | Operated by MHS Aciation GmbH | D | TRAFFIC |
| 17 | RNAC | REINAUER TRANSPORTATION COMPANIES | | | SCAC3 |
| 18 | RNAC | REINAUER TRANSPORTATION | | | SCAC4 |
| 19 | RNAD | Royal Navy Armaments Depots | | GB | TRAFFIC |
| 20 | RNAE | R & A ENTERPRISES | | | SCAC3 |
| 21 | RNAF | R & A FREIGHT SERVICES INC | | | SCAC3 |
| 22 | RNAG | RNA TRANSPORT | | | SCAC4 |
| 23 | RNAI | R&A TRUCKING COMPANY | | | SCAC3 |
| 24 | RNAI | R & A TRUCKING CO | | | SCAC4 |
| 25 | RNAK | R & A TRUCKING CO | | | SCAC3 |
| 26 | RNAM | R & A LEASING INC | | | SCAC3 |
| 27 | RNAM | RIDGEWAY NORTH AMERICA LIMITED | | | SCAC4 |
| 28 | RNAN | RICHNAN CORP | | | SCAC4 |
| 29 | RNAP | R & A PRODUCE LTD | | | SCAC4 |
| 30 | RNAQ | RENAUD INC | | | SCAC3 |
| 31 | RNAQ | RONAN, DOUG AIRCRAFT SALES | | | SCAC4 |
| 32 | RNAS | RON AND SONS TRUCKING INC | | | SCAC3 |
| 33 | RNAS | RON & SONS TRUCKING INC | | | SCAC4 |
| 34 | RNAS | Royal Naval Air Service | The Royal Naval Air Service (RNAS) was the air arm of the Royal Navy, under the direction of the Admiralty's Air Department, and existed formally from 1 July 1914[1] to 1 April 1918 | GB | TRAFFIC |
| 35 | RNAT | R & A TRUCKING | | | SCAC3 |
| 36 | RNAT | R & A TRANS CORP | | | SCAC4 |
| 37 | RNB | Rosneft-Baltika, Joint-Stock Company | Callsign: Rosbalt, | RUS | AVCODES |
| 38 | RNB | Rosneft-Baltika | | | ICAO1 |
| 39 | RNB | Ringe - Nyborg Banen | 1897 - 1962 | DK | jernbanen.dk |
| 40 | RNB | Ringe - Nyborg Banen | 1897 - 1962 | DK | TRAFFIC |
| 41 | RNBA | R & B TRUCKING | | | SCAC3 |
| 42 | RNBF | REYNOSO BROS FOODS | | | SCAC3 |
| 43 | RNBF | R & B FREIGHT LINES | | | SCAC4 |
| 44 | RNBG | R & B TRANSPORT | | | SCAC3 |
| 45 | RNBI | R N B INC | | | SCAC3 |
| 46 | RNBK | R & B TRUCKING | | | SCAC3 |
| 47 | RNBL | RAINBOW LINES | | | SCAC3 |
| 48 | RNBM | RAINBOW MOVERS INC | | | SCAC3 |
| 49 | RNBO | RAINBOW TRANSPORT | | | SCAC3 |
| 50 | RNBQ | R & B TRUCKING INC | | | SCAC3 |
| 51 | RNBT | RAINBO OIL COMPANY-TRANSPORT SALES | | | SCAC4 |
| 52 | RNBV | R & B TRUCK LINE CO | | | SCAC3 |
| 53 | RNBW | RAINBOW EXPRESS INC | | | SCAC3 |
| 54 | RNCA | RANCHO NC ALPACAS | | | SCAC4 |
| 55 | RNCE | R & C EXPRESS INC | | | SCAC3 |
| 56 | RNCH | RANCH, J B | | | SCAC3 |
| 57 | RNCH | RANACHO 6 HERMANOS | | | SCAC4 |
| 58 | RNCH | Railion Schweiz GmbH | | CH | VKM |
| 59 | RNCI | RAISIN CAIN INC | | | SCAC4 |
| 60 | RNCK | ROMAN TRUCKING | | | SCAC3 |
| 61 | RNCK | RONCO EXPRESS INC | | | SCAC4 |
| 62 | RNCO | RANCHO TRUCKING INC | | | SCAC3 |
| 63 | RNCP | RENNER, C PETROLEUM | | | SCAC4 |
| 64 | RNCQ | ROADRUNNER CHARTERS INC | | | SCAC4 |
| 65 | RNCS | RENEGADE COMPANIES, INC | | | SCAC3 |
| 66 | RNCT | RANCH TRUCKING | | | SCAC3 |
| 67 | RNCT | RAINCOAST DOOR & SPECIALTY WOOD PRO | | | SCAC4 |
| 68 | RNCU | REGENCY NAVIGATION CO LTD | | | SCAC3 |
| 69 | RNCV | R & C TRANSPORTATION SERVICES INC | | | SCAC4 |
| 70 | RNCX | North Carolina Dept. of Transportation, Rail Division | 7/2005 (not listed) | | NAKINA |
| 71 | RNCX | NORTH CAROLINA DEPT. OF TRANSPORTATION, RAIL DIV. | | | PWRC |
| 72 | RNCX | NORTH CAROLINA DEPARTMENT OF TRANSP | | | SCAC4 |
| 73 | RND | Rutland Aviation Limited | Callsign: Rutland, | GB | AVCODES |
| 74 | RND | Rutland Aviation | | | ICAO1 |
| 75 | RNDF | RND TRANSPORT LLC | | | SCAC4 |
| 76 | RNDI | R & D TRANSPORTATION INC | | | SCAC4 |
| 77 | RNDJ | R & D TRUCKING | | | SCAC3 |
| 78 | RNDK | RANDECKER TRUCKING INC | | | SCAC3 |
| 79 | RNDL | RANDALL'S EXPRESS, INC | | | SCAC3 |
| 80 | RNDM | RANDALL MOVERS | | | SCAC3 |
| 81 | RNDO | REX N DON VAN LINES INC | | | SCAC3 |
| 82 | RNDO | REXDON INC | | | SCAC4 |
| 83 | RNDP | RANDOLPH TRUCKING INC | | | SCAC3 |
| 84 | RNDQ | RANDLE'S TRUCKING SERVICE. | | | SCAC3 |
| 85 | RNDQ | RANDLES TRUCKING SERVICE | | | SCAC4 |
| 86 | RNDT | R & D TRUCKING | | | SCAC3 |
| 87 | RNDU | RANDAR LLC | | RUS | BIC |
| 88 | RNDV | REINDERS TRANSPORTATION SERVICE INC | | | SCAC3 |
| 89 | RNDX | American Railcar Leasing, Inc. | added 4/2005; 7/2005 | | NAKINA |
| 90 | RNDX | ACF Industries, Inc. | added 10/2000; eliminated 4/2005 | | NAKINA |
| 91 | RNDX | ACF Industries, Inc., Amcar Division | 1/1994-7/2000 (not listed) | | NAKINA |
| 92 | RNDX | ACF Industries, Inc., Amcar Division —temporary expiring 1Jan81 | 1/1980 | | NAKINA |
| 93 | RNDX | ACF Industries, Inc., Amcar Division —temporary expiring 1Apr75 | 1/1975 | | NAKINA |
| 94 | RNDX | American Car and Foundry Division, ACF Industries Inc. —temporary expiring 1Apr71 | 4/1970 | | NAKINA |
| 95 | RNDX | American Car and Foundry Division, ACF Industries Inc. -- temporary expiring 1Apr71 | Apr-70 | | NRHS |
| 96 | RNDX | ACF Industries, Inc., Amcar Division -- temporary expiring 1Apr75 | Jan-75 | | NRHS |
| 97 | RNDX | ACF Industries, Inc., Amcar Division -- temporary expiring 1Jan81 | Jan-80 | | NRHS |
| 98 | RNDX | ACF Industries, Inc., Amcar Division | 1/94-7/2000 | | NRHS |
| 99 | RNDX | ACF Industries, Inc. | added 10/2000 | | NRHS |
| 100 | RNDX | AMERICAN RAILCAR LEASING, INC. [ACF INDUSTRIES INC. AMCAR DIV.] | | | PWRC |
