| 1 | REO | Rio Airways | Callsign: Rio, | USA | AVCODES |
| 2 | REO | Rio Airways | | | ICAO1 |
| 3 | REO | Rio Airways | Real: REO / XO, 1965 - 1987 | USA | TRAFFIC |
| 4 | REOB | RECTOR, B & SONS TRUCKING | | | SCAC3 |
| 5 | REOD | REDERIET OTTO DANIELSEN | | | SCAC3 |
| 6 | REOE | REYNOLDS EXPRESS INC | | | SCAC3 |
| 7 | REOF | RELIANT TRUCKING COMPANY | | | SCAC3 |
| 8 | REOL | Reolian Public Transport Co. | The company was a joint venture between Veolia Transport RATP Asia (VTRA) and a company in Macau, the HN Group.[1] It was declared bankrupt by the Macau judiciary on December 4, 2013. | | TRAFFIC |
| 9 | REOM | REO MOVERS & VAN LINES, INC | | | SCAC3 |
| 10 | REOM | REO MOVERS & VAN LINES INC | | | SCAC4 |
| 11 | REON | REON TRANSPORTATION | | | SCAC3 |
| 12 | REON | REONIAT LLC | | | SCAC4 |
| 13 | REOO | REO TRANSPORTATION | | | SCAC3 |
| 14 | REOP | R E AUTO TRANSPORTERS | | | SCAC3 |
| 15 | REOP | REDCO TRANSPORT LTD | | | SCAC4 |
| 16 | REOR | REM TRANSPORT | | | SCAC3 |
| 17 | REOS | RESOURCE TECHNOLOGY SERVICES INC | | | SCAC3 |
| 18 | REOT | REGIONAL EXPEDITE LTD (SUBSIDIARY O | | | SCAC4 |
