| 1 | NEC | Necon Air Ltd. | IATA: 3Z, Callsign: Necon Air, IATA Prefix: 741, Designator 3Z reinstated by IATA. Established 14 September 1992. Suspended flights in 2003 due to financial difficulties. | NEP | AVCODES |
| 2 | NEC | Necon Air | | | ICAO1 |
| 3 | NEC | NORTHEAST CORRIDER (AMTRAK) | | | PWRC |
| 4 | NECA | NELSON, CLARENCE A | | | SCAC3 |
| 5 | NECC | NEW ENGLAND CARTAGE CORP | | | SCAC3 |
| 6 | NECD | NEW ENGLAND COURIER INC | | | SCAC3 |
| 7 | NECG | NEWCOM SERVATICE GENTS INC | | | SCAC3 |
| 8 | NECG | NOW EXPRESS CARTAGE INC | | | SCAC4 |
| 9 | NECH | NEW CHARTER BUS SERVICE INC | | | SCAC3 |
| 10 | NECI | NORTHEAST CORRIDOR EXPRESS INC | | | SCAC3 |
| 11 | NECJ | NEC TRADE SERVICE LTD | | | SCAC3 |
| 12 | NECK | Neckarwerke | | D | TRAFFIC |
| 13 | NECL | NEWCORP LEASING INC | | | SCAC3 |
| 14 | NECM | NEWCOMB OIL CO LLC | | | SCAC4 |
| 15 | NECN | NEW-CON TRANSPORTATION INC | | | SCAC3 |
| 16 | NECO | NECO TRANSPORT LTD | | | SCAC4 |
| 17 | NECP | NORTHEAST CARTAGE COMPANY INC | | | SCAC3 |
| 18 | NECP | NORTHEAST CARTAGE COMPANY INC | | | SCAC4 |
| 19 | NECQ | NEW CASTLE TRUCK SERVICE | | | SCAC3 |
| 20 | NECR | New England Central R.R., Inc. | added 7/1995; 7/2000-7/2005 | | NAKINA |
| 21 | NECR | New England Central R.R., Inc. | added 7/95; 7/2000 | | NRHS |
| 22 | NECR | NEW ENGLAND CENTRAL RAILROAD | | | PWRC |
| 23 | NECR | New England Central Railroad | | | RSRV |
| 24 | NECR | NEW ENGLAND CENTRAL RAILROAD INC | | | SCAC4 |
| 25 | NECR | New England Central | | USA | TRAFFIC |
| 26 | NECS | NEBRASKA COAST INC | | | SCAC3 |
| 27 | NECS | NEBRASKA COAST INC | | | SCAC4 |
| 28 | NECU | NAT SHIPPING BAGGING SERVICES LTD. & ASSOCIATES | | GB | BIC |
| 29 | NECU | NAT SHIPPING BAGGING SERVICES LTD & | | | SCAC4 |
| 30 | NECV | NEECE, VICTOR H | | | SCAC3 |
| 31 | NECW | NEW ENGLAND COACH LINES | | | SCAC3 |
| 32 | NECX | Mid-Am Equipment, Inc. | added 7/1981; 1/1994-7/2005; eliminated 7/2008 | | NAKINA |
| 33 | NECX | Northeastern Central Railcar Leasing, Inc. | added 1/1979; 1/1980; eliminated 4/1981 | | NAKINA |
| 34 | NECX | New England Coal & Coke Co. (Bethlehem Mines Corp.) | 8/1920 | | NAKINA |
| 35 | NECX | Northeastern Central Railcar Leasing, Inc. | added 1/79; 1/80; eliminated 4/81 | | NRHS |
| 36 | NECX | Mid-Am Equipment, Inc. | added 7/81; 1/94-7/2000 | | NRHS |
| 37 | NECX | *BETHLEHEM MINES CORP. [NEW ENGLAND CVOAL & COKE CO.] | | | PWRC |
| 38 | NECX | +MID-AM EQUIPMENT, INC. [NORTHEASTERN RAILCAR LEASING, INC.] | | | PWRC |
| 39 | NECX | Mid-Am Equipment | | | RSRV |
| 40 | NECX | MID-AM EQUIPMENT INC | | | SCAC4 |
| 41 | NECY | NICKS EXPRESS CO | | | SCAC4 |
