| 1 | NOO | Nor Aviation A/S | Callsign: Midnight, ICAO designator changed to MDT / Name changed to Sundt Air 01 July 2000. | N | AVCODES |
| 2 | NOOB | NOR OBO SHIPPING | | | SCAC3 |
| 3 | NOOC | NORTHERN OIL COMPANY INC | | | SCAC4 |
| 4 | NOOF | NINE ONE ONE FIVE THREE THREE ZERO | | | SCAC4 |
| 5 | NOOK | NOOKSACK VALLEY TRANSPORT INC | | | SCAC3 |
| 6 | NOOM | NORTHERN OILSEED MILLS | | | SCAC4 |
| 7 | NOON | NOONS, JOHN F, INC | | | SCAC3 |
| 8 | NOOP | NORTH OPERATING COMPANY | | | SCAC3 |
| 9 | NOOR | NOORT TRUCKING LTD | | | SCAC4 |
| 10 | NOOR | NoordNed | | NL | TRAFFIC |
| 11 | NOOTEBOOM | Noteboom | | NL | TRAFFIC |
| 12 | NOOV | NINE ONE ONE ZERO-TWO TWO | | | SCAC4 |
