| Abbreviation | Definition |
|---|---|
| NYP | New York Paris |
| NYP | New York to Paris |
| NYPDBLUE | New York Police Department |
| NYWT | New York Water Taxi |
| NZ | Non- Zone |
| NZB | Nanjing / Zhangjiagang / Shanghai Barge |
| NZC | Near Zero Conditions |
| NZX | New Zealand Express Service |
| O/D | Origin and Destination |
| O/D | Overdrive |
| O/F | Only Freight |
| O3 | Ozone |
| OA | Onepass Aadvantage |
| OADM | Oracle Airline Data Model |
| OAG | Official Airline Guide |
| OAG | Official Airline Guides |
| OAG | Overseas Airline Guide |
| OAK | Metropolitan Oakland International Airport |
| OAL | Over All Length |
| OALT | Operational Acceptable Level of Traffic |