| 701 | NAY | Navegacion Servicios Aereos Canarios SA | | | ICAO1 |
| 702 | NAYE | NAYE, JAMES M, INCORPORATED | | | SCAC3 |
| 703 | NAYL | NAYLOR TRUCKING INC | | | SCAC4 |
| 704 | NAYQ | NAYLOR, CLEADOUS | | | SCAC3 |
| 705 | NAZ | Servicios Aereos Del Nazas, S.A. de C.V. | Callsign: Nazas, | MEX | AVCODES |
| 706 | NAZ | Servicios Aereos del Nazas SA de CV | | | ICAO1 |
| 707 | NAZ | NORTH AMERICAN CO. | | | PWRC |
| 708 | NAZA | NAZARIAN, JOHN, INC | | | SCAC3 |
| 709 | NAZM | NORTHERN ARIZONA MOVING & STORAGE | | | SCAC3 |
| 710 | NAZU | JSC NEVINNOMYSSKY AZOT | | RUS | BIC |
| 711 | NB | Sterling European Kommanditaktieselskab | ICAO: SNB, Callsign: Sterling, IATA Prefix: 373, Name changed to Sterling Airlines A/S. Formerly Sterling Airlines A/S | DK | AVCODES |
| 712 | NB | Sterling Airlines A/S | ICAO: SAW, Callsign: Sterling, | DK | AVCODES |
| 713 | NB | Sterling Airways Ltd. | ICAO: SAW, Callsign: Sterling, | DK | AVCODES |
| 714 | NB | Sterling Airlines A/S | ICAO: SNB, Callsign: Sterling, IATA Prefix: 373, Ceased operations on 29 October 2008. Name changed from Sterling European Kommanditaktieselskab. Formerly Sterling Airlines A/S | DK | AVCODES |
| 715 | NB | Skypower Express Airways Nigeria Ltd. | | WAN | AVCODES |
| 716 | NB | Berniq Airways | ICAO: BNL, Callsign: Manara, | LAR | AVCODES |
| 717 | NB | Consolidated Rail Corp. | added 7/1980; eliminated 7/1999 | | NAKINA |
| 718 | NB | Northampton and Bath R.R. Co. | 1/1946-10/1966 & 1/1975; eliminated 4/1979 | | NAKINA |
| 719 | NB | Northampton and Bath R.R. Co. | 1/52-10/66 & 1/75; eliminated 4/79 | | NRHS |
| 720 | NB | Consolidated Rail Corp. | added 7/80; eliminated 7/99 | | NRHS |
| 721 | NB | NiedersachsenBahn GmbH & Co KG | Celle | D | privat-bahn.de |
| 722 | NB | CONSOLIDATED RAIL CORP. [NORTHAMPTON & BATH RR] | | | PWRC |
| 723 | NB | Northampton and Bath Railroad (Conrail) | | | RSRV |
| 724 | NBA | North East Bolivian Airways (NEBA) | Callsign: Neba, Founded in 1970. Ceased operations during 2006. | BOL | AVCODES |
| 725 | NBAC | NORFOLK, BALTIMORE & CAROLINA LINE | | | SCAC3 |
| 726 | NBAI | NIAGARA BAITS | | | SCAC4 |
| 727 | NBAN | NYK BULKSHIP (ATLANTIC) NV | | | SCAC4 |
| 728 | NBAW | NORDIA BULK A/S | | | SCAC4 |
| 729 | NBBC | NEWBURGH BEACON BUS CORP | | | SCAC3 |
| 730 | NBBC | NOBLES, BUTCH TRUCKING | | | SCAC4 |
| 731 | NBBH | NATIONAL BROKERS | | | SCAC3 |
| 732 | NBBS | NEBBS, R J TRANSPORTATION INC | | | SCAC3 |
| 733 | NBBS | N B TRUCKING LLC | | | SCAC4 |
| 734 | NBCC | NEPTUNE BUS COMPANY INC | | | SCAC3 |
| 735 | NBCC | NINE ZERO TWO FOUR-ONE EIGHT ZERO T | | | SCAC4 |
| 736 | NBCG | NORTHEAST BULK CARTAGE COMPANY | | | SCAC3 |
| 737 | NBCH | NINE ZERO SEVEN SIX-NINE THREE TWO | | | SCAC4 |
| 738 | NBCI | NATIONAL BUS CARRIERS LTD | | | SCAC3 |
| 739 | NBCI | NINE ZERO ZERO EIGHT-NINE SIX SIX F | | | SCAC4 |
| 740 | NBCL | NIELSON BROS CARRIERS LTD | | | SCAC3 |
| 741 | NBCO | NEIMAN BROS CO INC | | | SCAC3 |
| 742 | NBCR | NEW BRUNSWICK COAL AND RAILWAY | | | SCAC3 |
| 743 | NBCT | N B C TRANSPORTATION | | | SCAC3 |
| 744 | NBCT | N B C TRANSPORTATION | | | SCAC4 |
| 745 | NBCU | BUNNIK CREATIONS | | NL | BIC |
| 746 | NBCX | Nebraska Boiler Co. | 7/2000-7/2005 (not listed) | | NAKINA |
| 747 | NBCX | National Car Co. | 1/1943-4/1947 | | NAKINA |
| 748 | NBCX | National Butter Co. of Iowa (American Refrigerator Transit Co.) | 7/1935 | | NAKINA |
| 749 | NBCX | Nebraska Boiler Co. | Jul-00 | | NRHS |
| 750 | NBCX | *NATIONAL CAR CO. | | | PWRC |
| 751 | NBCX | +NEBRASKA BOILER CO. | | | PWRC |
| 752 | NBCX | Nebraska Boiler | | | RSRV |
| 753 | NBCX | NEBRASKA BOILER COMPANY | | | SCAC4 |
| 754 | NBDI | NORTHFORK BISON DISTRIBUTION INC | | | SCAC4 |
| 755 | NBDS | North Brabant German Railway Company | Dorog, Sand mine | NL | TRAFFIC |
| 756 | NBDT | NEW BRUNSWICK DEPARTMENT TOURISM AN | | | SCAC4 |
| 757 | NBE | Novosibirsk Aviaenterprise | Callsign: Nakair, | RUS | AVCODES |
| 758 | NBE | Novosibirsk Aviaenterprise | | | ICAO1 |
| 759 | NBE | NBE Rail GmbH | Aschaffenburg (NBE = Nordbayerische Eisenbahn) | D | privat-bahn.de |
| 760 | NBE | Nordbahn Eisenbahngesellschat mbH & Co KG | Kaltenkirchen | D | privat-bahn.de |
| 761 | NBE | Nordbayerische Eisenbahn GmbH | Real: NBEG | D | TRAFFIC |
| 762 | NBE | Nordbahn Eisenbahngesellschaft | | DE | VKM |
| 763 | NBEC | Canadian National Rys. | added 7/2009 | | NAKINA |
| 764 | NBEC | New Brunswick East Coast Ry. Co., Inc. | 7/2000-7/2005; eliminated 7/2009 | | NAKINA |
| 765 | NBEC | New Brunswick East Coast Ry. Co., Inc. | Jul-00 | | NRHS |
| 766 | NBEC | NEW BRUNSWICK EAST COAST RAILWAY CO. | | | PWRC |
| 767 | NBEC | New Brunswick East Coast Railway | | | RSRV |
| 768 | NBEC | NEW BRUNSWICK EAST COAST RAILWAY CO | | | SCAC4 |
| 769 | NBEG | NORTH BERGEN REX TRANSPORT INC | | | SCAC3 |
| 770 | NBEG | Nordbayerische Eisenbahn GmbH | | DE | VKM |
| 771 | NBEL | NOBEL SHIPPING INC | | | SCAC3 |
| 772 | NBEL | NOBLE LOGISTICS / NLS | | | SCAC4 |
| 773 | NBEL | NBE Logistik GmbH | | DE | VKM |
| 774 | NBEP | NELLY BELL EXPRESS | | | SCAC4 |
| 775 | NBEP | NBE Rail Polska | Owned by NBE Rail: Nordbayerische Eisenbahn | PL | TRAFFIC |
| 776 | NBER | Nittany & Bald Eagle R.R. Co. | added 1/1985; 1/1994-7/2005 | | NAKINA |
| 777 | NBER | Nittany & Bald Eagle R.R. Co. | added 1/85; 1/94-7/2000 | | NRHS |
| 778 | NBER | NITTANY & BALD EAGLE RAILROAD | | | PWRC |
| 779 | NBER | Nittany and Bald Eagle Railroad | | | RSRV |
| 780 | NBER | NITTANY & BALD EAGLE RAILROAD CO | | | SCAC3 |
| 781 | NBER | Nittany & Bald Eagle | | USA | TRAFFIC |
| 782 | NBES | N&B EXPRESS, INC | | | SCAC3 |
| 783 | NBES | N & B EXPRESS INC | | | SCAC4 |
| 784 | NBET | NEELEY, BILL E TRANSPORTATION INC | | | SCAC3 |
| 785 | NBFI | NATIONAL BEDDING & FURNITURE INDUST | | | SCAC3 |
| 786 | NBFM | NOBODYS BUSINESS FARM INC | | | SCAC4 |
| 787 | NBG | Norddeutsche Bahngesellschaft mbH | Celle | D | privat-bahn.de |
| 788 | NBGD | NEW BEDFORD GEAR DIV | | | SCAC3 |
| 789 | NBGT | N B G TRUCKING | | | SCAC3 |
| 790 | NBGU | ROLANDE LNG BV | | | SCAC4 |
| 791 | NBHI | NATIONAL BOAT HAULERS INC | | | SCAC4 |
| 792 | NBHM | NICKEL BROS HOUSE MOVING USA INC | | | SCAC4 |
| 793 | NBHR | NOBLE, H & R CONSTRUCTION LTD | | | SCAC4 |
| 794 | NBHT | NEW BHANDAL TRANSPORT INC | | | SCAC4 |
| 795 | NBIC | NANCY'S BROKERAGE INC | | | SCAC4 |
| 796 | NBIK | Nostalgiebahnen in Kärnten | | AT | VKM |
| 797 | NBIL | NB INTERSTATE LOGISTICS LLC | | | SCAC4 |
| 798 | NBIS | NORTHSTAR BISON | | | SCAC4 |
| 799 | NBIX | The CIT Group/Capital Finance, Inc. | added 4/2007 | | NAKINA |
| 800 | NBIX | Bombardier Capital Rail, Inc. | added 10/1999; 7/2000-7/2005; eliminated 4/2007 | | NAKINA |
