| 1 | NAO | North American Airlines, Inc. | IATA: NA, Callsign: North American, IATA Prefix: 455, Founded in 1989. Ceased operations on 07 June 2014. Designator NA reinstated by IATA. IATA designator changed from XG | USA | AVCODES |
| 2 | NAO | North American Airlines, Inc. | IATA: XG, Callsign: North American, IATA designator changed to NA | USA | AVCODES |
| 3 | NAOD | NORTH AMERICAN TOOL & DIE | | | SCAC4 |
| 4 | NAOL | NATIVE OILFIELD SERVICES LLC | | | SCAC4 |
| 5 | NAOM | NAOMIS WORLD TRAVEL SERVICE INC | | | SCAC3 |
| 6 | NAOR | NAC CORPORATION | | | SCAC3 |
| 7 | NAOS | NAOS COMPANIA ARMADORA S A | | | SCAC3 |
