| 1 | NIK | Niko Air Ltd. | Callsign: Nik Air, Ceased Operations. | BG | AVCODES |
| 2 | NIKC | NICKEL CITY TRANSPORT & LEASING COM | | | SCAC3 |
| 3 | NIKE | NIKE MESSENGER SERVICE INC | | | SCAC3 |
| 4 | NIKI | NIKI NAVIGATION | | | SCAC3 |
| 5 | NIKK | NIKOS TRANSPORT & STORAGE INC | | | SCAC4 |
| 6 | NIKL | NICKELLS VAN & STORAGE INC | | | SCAC3 |
| 7 | NIKM | NIKO MARITIME INC PIRAEUS GREECE | | | SCAC3 |
| 8 | NIKS | NIK TRANSPORT INC | | | SCAC4 |
| 9 | NIKU | NORILSK FORWARDING COMPANY LTD | | RUS | BIC |
| 10 | NIKX | N.I.K. Non-Stock Marketing Cooperative | added 1/1991; eliminated 7/1993; 1/1994-7/2005 (not listed) | | NAKINA |
| 11 | NIKX | N.I.K. Non-Stock Marketing Cooperative | added 1/91; eliminated 7/93; 1/94-7/2000 | | NRHS |
| 12 | NIKX | N.I.K. NON-STOCK MARKETING COOPERATIVE | | | PWRC |
| 13 | NIKX | NIK Non-stock Marketing Cooperative | | | RSRV |
| 14 | NIKX | N I K NON | | | SCAC4 |