| Airline Name | Image | Swaps |
| Oman Air-Oman: Design 7 |
| yes |
| Oman Air-Oman: Design 8 |
| yes |
| Oman Aviation Services-Oman |
| 0 |
| Omni Air International-USA |
| 0 |
| Omni Aviacao e Technologia-Portugal |
| 0 |
| Onur Air-Turkey: Design 1 |
| 0 |
| Onur Air-Turkey: Design 2 |
| 0 |
| Onur Air-Turkey: Design 3 |
| yes |
| Onur Air-Turkey: Design 4 |
| 0 |
| Onur Air-Turkey: Design 5 |
| yes |
| Onur Air-Turkey: Design 6 |
| 0 |
| Orbest Orizonia Airlines-Spain |
| 0 |
| Orbest-Iberworld Airlines-Spain |
| 0 |
| Orca Air-Egypt |
| 0 |
| Orenburg Airlines (Orenburgskie Avialinii)-Russia |
| 0 |
| Oriental Air Bridge-Japan: Design 1 |
| 0 |
| Oriental Air Bridge-Japan: Design 2 |
| 0 |
| Orion Airways-UK: Design 1 |
| yes |
| Orion Airways-UK: Design 2 |
| yes |
| Orion Airways-UK: Design 3 |
| yes |
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