| 1 | NAT | North Atlantic Air, Inc. | Callsign: Mass Air, | USA | AVCODES |
| 2 | NAT | North Atlantic Air Inc | | | ICAO1 |
| 3 | NAT | National Air Transport | The predecessor of United Airlines | USA | TRAFFIC |
| 4 | NATAN | Firma "Natan" Bogdan Głogowski | City: Płaza | PL | TRAFFIC |
| 5 | NATB | NATIONAL TRUCKING & MOVING CO | | | SCAC3 |
| 6 | NATB | BAT Group | | GB | TRAFFIC |
| 7 | NATC | NATCO INC | | | SCAC3 |
| 8 | NATD | NATURAL FREIGHT LTD NEW YORK NY | | | SCAC4 |
| 9 | NATE | NATIONWIDE TRUCK LINES INC | | | SCAC3 |
| 10 | NATE | N A T S NURSERY LTD | | | SCAC4 |
| 11 | NATF | NORTH AMERICA TRAFFIC INC | | | SCAC4 |
| 12 | NATG | NATIONWIDE MAGAZINE & BOOK DISTRIBU | | | SCAC3 |
| 13 | NATG | NATIONWIDE MAGAZINE & BOOK DISTRIBU | | | SCAC4 |
| 14 | NATH | NATIVE AMERICAN TRUCKING INC | | | SCAC3 |
| 15 | NATH | NATIVE AMERICAN TRUCKING INC | | | SCAC4 |
| 16 | NATI | NORDANG, ART TRUCKING INC | | | SCAC3 |
| 17 | NATI | NORDANG, ART TRUCKING INC | | | SCAC4 |
| 18 | NATJ | NATIONAL CITY TRUCK RENTAL | | | SCAC3 |
| 19 | NATJ | NATIONAL TRANSPORT INC | | | SCAC4 |
| 20 | NATK | NORTH AMERICAN TRANSPORTATION LLC | | | SCAC4 |
| 21 | NATL | NATIONAL TRUCKING CO OF LOS ANGELES | | | SCAC3 |
| 22 | NATL | NATIONAL OIL | | | SCAC4 |
| 23 | NATL | National | | GB | TRAFFIC |
| 24 | NATM | NATALIE MARITIME LTD | | | SCAC4 |
| 25 | NATN | N A T TRANSPORTATION INC | | | SCAC3 |
| 26 | NATN | N A T TRANSPORTATION INC | | | SCAC4 |
| 27 | NATO | NORTH AMERICAN TRANSPORTATION | | | SCAC3 |
| 28 | NATO | NORTH AMERICAN TANK LINE INC | | | SCAC4 |
| 29 | NATP | NEW AGE TRANSPORTATION DISTRIBUTION | | | SCAC4 |
| 30 | NATQ | NATALE FRANK INC | | | SCAC3 |
| 31 | NATQ | NATEX | | | SCAC4 |
| 32 | NATR | NATURES WONDER WHEATGRASS JUICE | | | SCAC4 |
| 33 | NATS | NATIONAL TRUCKING AND STORAGE CO IN | | | SCAC3 |
| 34 | NATS | N A T | | | SCAC4 |
| 35 | NATT | NORTH AMERICAN CARRIER GROUP LLC | | | SCAC4 |
| 36 | NATU | SHAPE | | B | BIC |
| 37 | NATU | NASSO SA | | | PWRC |
| 38 | NATU | Nasso SA | | | RSRV |
| 39 | NATU | NASSO S.A. | | | SCAC3 |
| 40 | NATU | SHAPE | | | SCAC4 |
| 41 | NATW | NATIONWIDE TRUCK BROKERS INC | | | SCAC3 |
| 42 | NATW | NATIONWIDE TRUCK BROKERS INC | | | SCAC4 |
| 43 | NATX | General Electric Rail Services Corp. | added 1/2000; 7/2000-7/2005 | | NAKINA |
| 44 | NATX | General Electric Railcar Services Corp. | added 1/1984; 1/1994; eliminated 1/2000 | | NAKINA |
| 45 | NATX | North American Car Corp. | 1/1950-1/1980; eliminated 1/1984 | | NAKINA |
| 46 | NATX | North American Tank Line (North American Car Corp.) | 1/1941-4/1947 | | NAKINA |
| 47 | NATX | North American Tank Line | 7/1937-4/1938 | | NAKINA |
| 48 | NATX | North American Tank Line (North American Car Corp.) | 7/1930-7/1935 | | NAKINA |
| 49 | NATX | North American Tank Line (North American Car Co.) | 8/1920-7/1923 | | NAKINA |
| 50 | NATX | North American Tank Line (North American Car Corp.) | Apr-38 | | NRHS |
| 51 | NATX | North American Car Corp. | 1/52-1/80 | | NRHS |
| 52 | NATX | General Electric Railcar Services Corp. | 1/94; eliminated 1/2000 | | NRHS |
| 53 | NATX | General Electric Rail Services Corp. | added 1/2000; 7/2000 | | NRHS |
| 54 | NATX | GENERAL ELECTRIC RAIL SERVICES CORP.[NORTH AMERICAN CAR CORP.; NORTH AMERICAN TANK LINE] | | | PWRC |
| 55 | NATX | North American Tank Line (GE Rail Services) | | | RSRV |
| 56 | NATX | GENERAL ELECTRIC RAILCAR SERVICES C | | | SCAC4 |
| 57 | NATX | North Americal Tank Line | | USA | TRAFFIC |
| 58 | NATY | NATIONAL GYPSUM ENERGY COMPANY | | | SCAC4 |
| 59 | NATZ | NORTH AMERICAN TRANSPORTATION | | | PWRC |
| 60 | NATZ | North American Transportation | | | RSRV |
| 61 | NATZ | NORTH AMERICAN TRANSPORTATION | | | SCAC4 |
