| 1 | KNA | Knight Air Ltd. | Callsign: Knightair, | GB | AVCODES |
| 2 | KNA | Kuwait National Airways (K.C.S.) | IATA: KW, Name changed to Wataniya Airways | KWT | AVCODES |
| 3 | KNA | Kunming Airlines Co., Ltd. | IATA: KY, Callsign: Kunming Air, IATA Prefix: 833, | PRC | AVCODES |
| 4 | KNA | Knight Air | | | ICAO1 |
| 5 | KNAA | KNAACK DRAY LINE | | | SCAC3 |
| 6 | KNAA | KNIGHT TRANSPORT | | | SCAC4 |
| 7 | KNAB | K&N TRANSPORT LTD | | | SCAC4 |
| 8 | KNAC | KEENAN CORP, THE | | | SCAC4 |
| 9 | KNAF | KENWORTHY AIR FREIGHT SERVICES INC | | | SCAC3 |
| 10 | KNAG | K & A TRUCKING | | | SCAC3 |
| 11 | KNAI | KING AIR INC | | | SCAC3 |
| 12 | KNAI | KERR, JAMES TRUCKING | | | SCAC4 |
| 13 | KNAK | KNAACK MANUFACTURING CO | | | SCAC3 |
| 14 | KNAK | KNAACK MANUFACTURING CO | | | SCAC4 |
| 15 | KNAL | K & A LEASING COMPANY INC | | | SCAC3 |
| 16 | KNAL | KANALCO LIMITED | | | SCAC4 |
| 17 | KNAM | KERSHNER TRUCKING INC | | | SCAC4 |
| 18 | KNAN | KONAN EXPRESS INC | | | SCAC4 |
| 19 | KNAO | KANE AUTO TRANSPORT INC | | | SCAC3 |
| 20 | KNAP | KNAPP, ROBERT E | | | SCAC3 |
| 21 | KNAPE | GSG Knape / Max Knape | | D | TRAFFIC |
| 22 | KNAQ | KANAWAH CARTAGE COMPANY | | | SCAC3 |
| 23 | KNAQ | K & N TRUCKING INC | | | SCAC4 |
| 24 | KNAR | KINARD TRUCKING, INC. | | | SCAC3 |
| 25 | KNAR | KINARD TRUCKING INC | | | SCAC4 |
| 26 | KNAS | KNAPPENBERGER, STANLEY A | | | SCAC3 |
| 27 | KNAS | KNAUSS TRANSPORTATION INC | | | SCAC4 |
| 28 | KNAT | KNAPPTON MARITIME CORPORATION | | | PWRC |
| 29 | KNAU | KNAUERS EXPRESS AND STORAGE COMPANY | | | SCAC3 |
| 30 | KNAUF | Knauf Deutsche Gipswerke. KG | | DE | VKM |
| 31 | KNAUSS | Knauss-Reisen Dieter Frank GmbH | | D | TRAFFIC |
| 32 | KNAY | KOOTENAY WOOD TRANSPORT LTD | | | SCAC4 |
