| 1 | RU | TCI Skyking Ltd. | ICAO: SKI, Callsign: Skyking, Founded in 1994. Ceased operations on 22 October 2008 on as merged into Air Turks and Caicos. Desigantor RU* reinstated by IATA | USA | AVCODES |
| 2 | RU | SATA | | CH | AVCODES |
| 3 | RU | Rousseau Aviation | | F | AVCODES |
| 4 | RU | Compagnie de Transport Aerien (CTA) | ICAO: CTA, Callsign: CTA, Desigantor RU recalled by IATA | CH | AVCODES |
| 5 | RU | AirBridge Cargo Airlines Limited | ICAO: ABW, Callsign: AirBridge Cargo, IATA Prefix: 580, IATA designator changed from BO. Founded in 2004. | RUS | AVCODES |
| 6 | RU | Ryazan'- Urals Railway | | RU | TRAFFIC |
| 7 | RUA | Rwanda Airlines | IATA: 9R, Designator 9R recalled by IATA | RWA | AVCODES |
| 8 | RUA | Russow Aviation GmbH | Callsign: Overnight, | D | AVCODES |
| 9 | RUA | Rwanda Airlines | Designator 9R recalled by IATA | RWA | AVCODES |
| 10 | RUA | Rwanda Airlines | | | ICAO1 |
| 11 | RUAD | RURAL AIR DELIVERY SERVICE INC | | | SCAC3 |
| 12 | RUAL | RUSSO, A & L | | | SCAC4 |
| 13 | RUAM | RUDISILL, A M | | | SCAC3 |
| 14 | RUAN | RUAN TRANSPORT CORPORATION | | | SCAC3 |
| 15 | RUAN | RUAN TRANSPORT CORPORATION | | | SCAC4 |
| 16 | RUAT | RUSSO, ARTHUR TRUCKING | | | SCAC3 |
| 17 | RUAT | RUDY, H E | | | SCAC4 |
| 18 | RUBD | RUMBOLD, EZRA & SON INC | | | SCAC3 |
| 19 | RUBE | RUBIO, NEMESIO G | | | SCAC3 |
| 20 | RUBF | RUMBOLD FARMS | | | SCAC3 |
| 21 | RUBI | RUBIN BROS WASTE CO | | | SCAC3 |
| 22 | RUBJ | RUBIANO, J H TRUCKING INC | | | SCAC4 |
| 23 | RUBK | RUBIO TRUCKING | | | SCAC4 |
| 24 | RUBM | RUBICON OIL COMPANY | | | SCAC4 |
| 25 | RUBQ | RUBBER CITY CARTAGE CO | | | SCAC3 |
| 26 | RUBR | RUBRIGHT INC | | | SCAC3 |
| 27 | RUBR | REINDEER AUTO RELOCATION | | | SCAC4 |
| 28 | RUBT | RUBENS TRANSPORT/RUBEN ESINOZA TRUC | | | SCAC3 |
| 29 | RUBU | RUBINO RS S.R.L. | | I | BIC |
| 30 | RUBV | RUBY SERVICES LTD. | | | SCAC3 |
| 31 | RUBY | RUBY TRANSPORT LTD | | | SCAC3 |
| 32 | RUC | Rutas Aereas de Venezuela RAV, S.A. | IATA: AW, Callsign: Rutaca, | YV | AVCODES |
| 33 | RUC | Rutas Aereas, C.A. d/b/a RUTACA | IATA: 5R, Callsign: Rutaca, Name changed to Rutas Aereas, C.A. d/b/a Rutaca Airlines | YV | AVCODES |
| 34 | RUC | Rutas Aereas, C.A. d/b/a Rutaca Airlines | IATA: 5R, Callsign: Rutaca, Name changed from Rutas Aereas, C.A. d/b/a RUTACA | YV | AVCODES |
| 35 | RUC | Rutas Aereas | | | ICAO1 |
| 36 | RUCA | RUSS/CAMP TRANSPORT SERVICE | | | SCAC3 |
| 37 | RUCC | RUDE CARRIER CORP | | | SCAC3 |
| 38 | RUCE | RUFF, CHARLES E | | | SCAC3 |
| 39 | RUCG | R U CARTAGE | | | SCAC3 |
| 40 | RUCH | RUSCH, A H DISTRIBUTING INC | | | SCAC3 |
| 41 | RUCO | RICE UNRUH CO | | | SCAC3 |
| 42 | RUCO | RICE-UNRUH REYNOLDS CO | | | SCAC4 |
| 43 | RUCS | RUSHCO SERVICES INC | | | SCAC3 |
| 44 | RUD | Air Anastasia Ltd | Callsign: Anastasia, | UA | AVCODES |
| 45 | RUD | Air Anastasia | | | ICAO1 |
| 46 | RUDD | RUDDWAY DRAYAGE, INC | | | SCAC3 |
| 47 | RUDE | RUDE TRANSPORTATION COMPANY, INC | | | SCAC3 |
| 48 | RUDH | RUDD, HARLAN D | | | SCAC3 |
| 49 | RUDH | RUIZ CARRILLO, IGNACIO & JUAN FRANC | | | SCAC4 |
| 50 | RUDI | RUDDS TRANSFER AND STORAGE INC | | | SCAC4 |
| 51 | RUDJ | RUDE, JOHN VAN & STORAGE COMPANY | | | SCAC3 |
| 52 | RUDK | RU-D TRUCKING | | | SCAC4 |
| 53 | RUDL | RUSSELL DELIVERY | | | SCAC4 |
| 54 | RUDN | RUDDLE TRUCKING INC | | | SCAC3 |
| 55 | RUDN | RIDEOUT CARREIRS INC | | | SCAC4 |
| 56 | RUDO | RUDOLPHS INC | | | SCAC3 |
| 57 | RUDO | RUDOLPH FREIGHT SYSTEMS INC | | | SCAC4 |
| 58 | RUDP | RUDOLPHS EXPRESS | | | SCAC3 |
| 59 | RUDP | RUDOLPHS SPECIALTY BAKERIES LTD | | | SCAC4 |
| 60 | RUDQ | RUDY TRANSFER INC | | | SCAC3 |
| 61 | RUDR | RUDY, RICHARD B INC | | | SCAC3 |
| 62 | RUDS | RUDE, MURRAY SERVICES INC | | | SCAC3 |
| 63 | RUDT | RUD, SCOTT TRUCKING INC | | | SCAC4 |
| 64 | RUDV | RUSH DELIVERY SERVICE CO | | | SCAC3 |
| 65 | RUDX | Ruddy Tank Car Co. | added 10/1968; 4/1970-7/2000; eliminated 4/2005; 7/2005 (not listed) | | NAKINA |
| 66 | RUDX | Reid's Union Dairy, Inc. | 7/1935 | | NAKINA |
| 67 | RUDX | Ruddy Tank Car Co. | added 10/68; 4/70-7/2000 | | NRHS |
| 68 | RUDX | RUDDY TANK CAR COMPANY | | | PWRC |
| 69 | RUDX | Ruddy Tank Car | | | RSRV |
| 70 | RUDX | RUDDY TANK CAR COMPANY | | | SCAC4 |
| 71 | RUEG | RUEGSEGGER, BENJAMIN H | | | SCAC3 |
| 72 | RUEH | RUEHLES TOWING INC | | | SCAC4 |
| 73 | RUEL | RUSSELL, TOM & SONS | | | SCAC3 |
| 74 | RUEN | RUBBER ENTERPRISES | | | SCAC4 |
| 75 | RUEQ | RUBRIGHT EXPED | | | SCAC3 |
| 76 | RUER | RUDISON, EDGAR TRUCKING | | | SCAC3 |
| 77 | RUES | RUTH EQUIPMENT AND SUPPLY CO | | | SCAC3 |
| 78 | RUET | RUETER, ELDEN TRUCKING INC | | | SCAC3 |
| 79 | RUEV | RUE, VAUGHN PRODUCE CO INC | | | SCAC3 |
| 80 | RUF | Air 1st Aviation Companies of Oklahoma, Inc. | Callsign: Rough Rider, | USA | AVCODES |
| 81 | RUFD | RUFFING, DAN TRUCKING | | | SCAC3 |
| 82 | RUFE | RUFF, E D | | | SCAC3 |
| 83 | RUFI | RUFFIN INC | | | SCAC3 |
| 84 | RUFM | RENEAU FARMS | | | SCAC4 |
| 85 | RUFO | RUFO TRANSPORT LEASING | | | SCAC3 |
| 86 | RUFQ | RUFF-WALKER TRANSFER CO INC | | | SCAC3 |
| 87 | RUFR | RUFFNER, LARRY A TRUCKING INC | | | SCAC3 |
| 88 | RUGD | RUST, GLEN D, AND WAYNE RUST, A PAR | | | SCAC3 |
| 89 | RUGG | RUGGIERO BROS INC | | | SCAC4 |
| 90 | RUGH | RUGH, WARD, INC | | | SCAC3 |
| 91 | RUGL | RUGGLES INC | | | SCAC3 |
| 92 | RUGN | RIENDEAU, GASTON | | | SCAC4 |
| 93 | RUGO | RUTIGLIANO PAPER STOCK INC | | | SCAC3 |
| 94 | RUGR | RUSSELLS GRAIN INC | | | SCAC3 |
| 95 | RUGR | RUG RATS CONTRACTING | | | SCAC4 |
| 96 | RUGT | RUNGE TRUCKING INC | | | SCAC3 |
| 97 | RUGU | RUGBY LIMITED | | | SCAC4 |
| 98 | RUH | Rusich-T, Aircompany CJSC | | RUS | AVCODES |
| 99 | RUH | Rusich-T | | | ICAO1 |
| 100 | RUHA | RUTHANNE TRUCKING | | | SCAC3 |
