| 1 | RX | Aviaexpress Plc. | ICAO: AEH, Callsign: Avex, Designator RX recalled by IATA | H | AVCODES |
| 2 | RX | East African Safari Air Limited | ICAO: HSA, Callsign: Car Hire, IATA designator changed to S9. Name changed from CHS Aviation Limited | EAK | AVCODES |
| 3 | RX | British Independent Airways Ltd. | ICAO: BXH, Callsign: Independent, | GB | AVCODES |
| 4 | RX | Redwing Airways, Inc. | ICAO: RWG, Callsign: Redwing Air, | USA | AVCODES |
| 5 | RX | Comite International de La Croix-Rouge Red Cross (International Committee) | ICAO: RED, Callsign: Red Cross, Designator RX recalled by IATA. Non-airline Org. in airline industry | CH | AVCODES |
| 6 | RX | HG Aviation Limited | ICAO: RGE, Callsign: Regent, | BD | AVCODES |
| 7 | RX | Oklahoma Tank Car Co. | 7/1937-1/1950 | | NAKINA |
| 8 | RX | Oklahoma Tank Car Co. | Apr-38 | | NRHS |
| 9 | RX | OKLAHOMA TANK CAR CO. | | | PWRC |
| 10 | RX | Rail-X AB | | SE | VKM |
| 11 | RXA | Arax Airlines Ltd. | | WAN | AVCODES |
| 12 | RXA | Australiawide Airlines Ltd. d/b/a Regional Express | IATA: ZL, Callsign: Rex, IATA Prefix: 899, | AUS | AVCODES |
| 13 | RXA | Regional Express | IATA: ZL | | ICAO1 |
| 14 | RXAQ | ROLLING EXPRESS AGENCY | | | SCAC3 |
| 15 | RXAQ | RENTX TRANSPORTATION SERVICES CORPO | | | SCAC4 |
| 16 | RXAT | REX AIRE TRANSPORT | | | SCAC3 |
| 17 | RXAT | REEFER XPRESS LINES INC (DIV OF | | | SCAC4 |
| 18 | RXBM | REXBURG MOBILE HOME SALES | | | SCAC3 |
| 19 | RXBM | ROLLON EXPRESS INC | | | SCAC4 |
| 20 | RXC | International Federation of Red Cross And Red Crescent Societies (IFRC) | | CH | AVCODES |
| 21 | RXCG | RAINIER EXPRESS CARGO | | | SCAC4 |
| 22 | RXCN | RX CONSOLIDATORS INC | | | SCAC3 |
| 23 | RXCN | REGIO EXPRESS | | | SCAC4 |
| 24 | RXCO | RICHMOND EXPRESS CO INC | | | SCAC3 |
| 25 | RXCQ | REXHAM CORP | | | SCAC3 |
| 26 | RXCU | TIANJIN RONG XIN TECHNOLOGY CO., LTD. | | PRC | BIC |
| 27 | RXDE | RX DELIVERY | | | SCAC3 |
| 28 | RXDE | RICOCHET XPRESS XPEDITERS INC | | | SCAC4 |
| 29 | RXDS | REED EXPRESS DELIVERY SERVICE | | | SCAC4 |
| 30 | RXEI | ROXIES EXPRESS INC | | | SCAC4 |
| 31 | RXF | Rizhao Ruixiang Flight Training Co., Ltd. | Callsign: Aiden, | PRC | AVCODES |
| 32 | RXIC | ROSS' EXPRESS, INC | | | SCAC3 |
| 33 | RXIC | ROSS EXPRESS INC | | | SCAC4 |
| 34 | RXIE | RV XPRESS INC | | | SCAC4 |
| 35 | RXIF | REX INTL FORWARDING CO LTD | | | SCAC4 |
| 36 | RXIT | REXITE INC | | | SCAC3 |
| 37 | RXKG | RUX TRUCKING | | | SCAC4 |
| 38 | RXL | Air Exel (France) | IATA: VJ, Callsign: Air Exel, | F | AVCODES |
| 39 | RXLD | RUSH EXPRESS LTD | | | SCAC3 |
| 40 | RXLI | ROUTE TRANSPORTATION & LOGISTICS IN | | | SCAC4 |
| 41 | RXLN | REDEX LOGISTICS INC | | | SCAC4 |
| 42 | RXLS | RAMAX LOGISTICS | | | SCAC4 |
| 43 | RXLT | REXLOR TRANSPORT INC | | | SCAC3 |
| 44 | RXLW | REIMER EXPRESS LINES, (WESTERN) LTD | | | SCAC3 |
| 45 | RXLW | REFLEX TRUCK LINERS | | | SCAC4 |
| 46 | RXM | Remex Ltd, Air Company | Callsign: Remex, | RUS | AVCODES |
| 47 | RXMC | ROMCAN EXPRESS LIMITED | | | SCAC4 |
| 48 | RXMQ | REX MOTOR FREIGHT COMPANY | | | SCAC3 |
| 49 | RXMQ | ROADSTAR EXPRESS LLC | | | SCAC4 |
| 50 | RXMY | REX MEYERS TRANSFER | | | SCAC3 |
| 51 | RXNA | ROXANA SHIPPING S A | | | SCAC4 |
| 52 | RXNC | REX & CO INC | | | SCAC3 |
| 53 | RXOC | REX OIL CO INC | | | SCAC4 |
| 54 | RXOM | REX OIL COMPANY INC | | | SCAC4 |
| 55 | RXP | Royal Aviation Express | Callsign: Roy Express, | CDN | AVCODES |
| 56 | RXP | RAM Express | Callsign: Express Maroc, | MA | AVCODES |
| 57 | RXP | Royal Aviation Express | | | ICAO1 |
| 58 | RXP | Rail Experts | | NL | TRAFFIC |
| 59 | RXPC | RAYNOR EXPRESS CORP | | | SCAC3 |
| 60 | RXPC | RAYNOR EXPRESS CORP | | | SCAC4 |
| 61 | RXPD | RARITAN EXPRESS DISTRIBUTION INC | | | SCAC3 |
| 62 | RXPE | R EXPRESS | | | SCAC3 |
| 63 | RXPE | RAI EXPRESS LINES LTD | | | SCAC4 |
| 64 | RXPF | RANGER EXPRESS FORWARDING INC | | | SCAC4 |
| 65 | RXPG | RESOURCE TRANSPORT LLC | | | SCAC4 |
| 66 | RXPH | ROAD XPRESS | | | SCAC4 |
| 67 | RXPI | REGIONAL EXPRESS INC | | | SCAC4 |
| 68 | RXPK | READY EXPRESS INC | | | SCAC4 |
| 69 | RXPL | REGAL TRANSPORT SYSTEMS LLC | | | SCAC4 |
| 70 | RXPN | RICHLAND EXPRESS INC | | | SCAC3 |
| 71 | RXPP | RELIABLE EXPRESS TRANSPORTATION INC | | | SCAC4 |
| 72 | RXPQ | REDLANDS EXPRESS CO INC | | | SCAC3 |
| 73 | RXPQ | RUXPINS EXPRESS | | | SCAC4 |
| 74 | RXPR | RELIABLE EXPRESS INC | | | SCAC3 |
| 75 | RXPR | RELIABLE EXPRESS INC | | | SCAC4 |
| 76 | RXR | Arax Airways | IATA: Y5, Designator Y5 recalled by IATA | AM | AVCODES |
| 77 | RXRC | REXROTH CORPORATION | | | SCAC3 |
| 78 | RXRE | REPUBLIC EXPRESS CORP | | | SCAC4 |
| 79 | RXRT | RITTER TRANSPORTATION | | | SCAC4 |
| 80 | RXSC | REXANAX SHIPPING COMPANY LIMITED | | | SCAC4 |
| 81 | RXSN | RELIABLE TRANSPORT SOLUTIONS | | | SCAC4 |
| 82 | RXST | RAMSEY EXPRESS TRUCKING | | | SCAC4 |
| 83 | RXT | Aeroxtra, S.A. de C.V. | Callsign: Aero-Extra, | MEX | AVCODES |
| 84 | RXT | Aeroxtra | | | ICAO1 |
| 85 | RXTC | ROMAN TRANSPORT INC | | | SCAC4 |
| 86 | RXTD | RAVAX TRUCKING LTD | | | SCAC4 |
| 87 | RXTI | RAYMEX TRANSPORT INC | | | SCAC4 |
| 88 | RXTK | REX TRUCKING INC | | | SCAC4 |
| 89 | RXTU | YANGZHOU RIXIN TONGYUN LOGISTIC EQUIPMENT CO., LTD. | | PRC | BIC |
| 90 | RXWY | REXWAY TRANSPORT INC | | | SCAC4 |
| 91 | RXX | Express Air Charter | Callsign: Rex Air, | CDN | AVCODES |
| 92 | RXX | King Air Charter | | ZA | AVCODES |
| 93 | RXX | Express Air Charter | | | ICAO1 |
| 94 | RXXZ | TRANSAMERICA LEASING INC [(REAZ) RETIRED 04-06-93 ATP (ACI 2374)] | | | PWRC |
| 95 | RXXZ | TIP Intermodal Services | | | RSRV |
| 96 | RXXZ | TRANSPORT INTERNATIONAL POOL INC | | | SCAC4 |
