| 1 | KN | Nantay Pty Ltd., d/b/a Maroomba Airlines | | AUS | AVCODES |
| 2 | KN | China United Airlines Co., Ltd. | ICAO: CUA, Callsign: Lianhang, ICAO Callsign changed to China United. Designator KN reinstated by IATA. | PRC | AVCODES |
| 3 | KN | Morris Air Service | ICAO: MSS, Callsign: Wasatch, Founded in 1984. Merged into Southwest Airlines in 1994. | USA | AVCODES |
| 4 | KN | Kelowna Flightcraft International Air Cargo Ltd. d/b/a Winnport Air Cargo | ICAO: KFA, Callsign: Flightcraft, IATA designator changed to W8 | CDN | AVCODES |
| 5 | KN | GKN Group Services Ltd. | ICAO: GKN, Callsign: Guest Keen, | GB | AVCODES |
| 6 | KN | China United Airlines Co., Ltd. | ICAO: CUA, Callsign: China United, ICAO Callsign changed from Lianhang. Designator KN reinstated by IATA. | PRC | AVCODES |
| 7 | KN | Kurt Nitzer GmbH&Co. KG | | DE | VKM |
| 8 | KNA | Knight Air Ltd. | Callsign: Knightair, | GB | AVCODES |
| 9 | KNA | Kuwait National Airways (K.C.S.) | IATA: KW, Name changed to Wataniya Airways | KWT | AVCODES |
| 10 | KNA | Kunming Airlines Co., Ltd. | IATA: KY, Callsign: Kunming Air, IATA Prefix: 833, | PRC | AVCODES |
| 11 | KNA | Knight Air | | | ICAO1 |
| 12 | KNAA | KNAACK DRAY LINE | | | SCAC3 |
| 13 | KNAA | KNIGHT TRANSPORT | | | SCAC4 |
| 14 | KNAB | K&N TRANSPORT LTD | | | SCAC4 |
| 15 | KNAC | KEENAN CORP, THE | | | SCAC4 |
| 16 | KNAF | KENWORTHY AIR FREIGHT SERVICES INC | | | SCAC3 |
| 17 | KNAG | K & A TRUCKING | | | SCAC3 |
| 18 | KNAI | KING AIR INC | | | SCAC3 |
| 19 | KNAI | KERR, JAMES TRUCKING | | | SCAC4 |
| 20 | KNAK | KNAACK MANUFACTURING CO | | | SCAC3 |
| 21 | KNAK | KNAACK MANUFACTURING CO | | | SCAC4 |
| 22 | KNAL | K & A LEASING COMPANY INC | | | SCAC3 |
| 23 | KNAL | KANALCO LIMITED | | | SCAC4 |
| 24 | KNAM | KERSHNER TRUCKING INC | | | SCAC4 |
| 25 | KNAN | KONAN EXPRESS INC | | | SCAC4 |
| 26 | KNAO | KANE AUTO TRANSPORT INC | | | SCAC3 |
| 27 | KNAP | KNAPP, ROBERT E | | | SCAC3 |
| 28 | KNAPE | GSG Knape / Max Knape | | D | TRAFFIC |
| 29 | KNAQ | KANAWAH CARTAGE COMPANY | | | SCAC3 |
| 30 | KNAQ | K & N TRUCKING INC | | | SCAC4 |
| 31 | KNAR | KINARD TRUCKING, INC. | | | SCAC3 |
| 32 | KNAR | KINARD TRUCKING INC | | | SCAC4 |
| 33 | KNAS | KNAPPENBERGER, STANLEY A | | | SCAC3 |
| 34 | KNAS | KNAUSS TRANSPORTATION INC | | | SCAC4 |
| 35 | KNAT | KNAPPTON MARITIME CORPORATION | | | PWRC |
| 36 | KNAU | KNAUERS EXPRESS AND STORAGE COMPANY | | | SCAC3 |
| 37 | KNAUF | Knauf Deutsche Gipswerke. KG | | DE | VKM |
| 38 | KNAY | KOOTENAY WOOD TRANSPORT LTD | | | SCAC4 |
| 39 | KNBA | KENBAY TRANSPORTATION INC | | | SCAC3 |
| 40 | KNBA | KEN BROS FARMS | | | SCAC4 |
| 41 | KNBE | K & B EXPRESS INC | | | SCAC3 |
| 42 | KNBG | KNIGHTSBRIDGE TRUCKING COMPANY | | | SCAC4 |
| 43 | KNBK | K & B TRUCKING | | | SCAC3 |
| 44 | KNBK | KNIGHT BROKERAGE LLC | | | SCAC4 |
| 45 | KNBN | KENNEBUNK NURSING HOME | | | SCAC3 |
| 46 | KNBP | KANEB PIPELINE COMPANY | | | SCAC3 |
| 47 | KNBQ | KNICKERBOCKER WAREHOUSE AND STORAGE | | | SCAC3 |
| 48 | KNBT | K & B TRANSPORT INC | | | SCAC3 |
| 49 | KNBT | K & B TRANSPORT INC | | | SCAC4 |
| 50 | KNC | Kingcome Navigation | 1/1980-7/2005 | | NAKINA |
| 51 | KNC | Kingcome Navigation | 1/1975 | | NAKINA |
| 52 | KNC | Kingcome Navigation | 1/80-7/2000 | | NRHS |
| 53 | KNC | Kingcome Navigation | Jan-75 | | NRHS |
| 54 | KNC | KINGCOME NAVIGATION | | | PWRC |
| 55 | KNC | Kingcome Navigation | | | RSRV |
| 56 | KNCA | KING CARS INC | | | SCAC3 |
| 57 | KNCB | KENDALL CAB CO | | | SCAC3 |
| 58 | KNCC | KNC | | | SCAC4 |
| 59 | KNCD | K & N CONTRACT DELIVERY SERVICE | | | SCAC3 |
| 60 | KNCE | KASTELAN COURIER SERVICE | | | SCAC3 |
| 61 | KNCG | KINSELLA CARTAGE, INC | | | SCAC3 |
| 62 | KNCH | KNICHEL LOGISTICS | | | SCAC4 |
| 63 | KNCI | KINECTRICS INC | | | SCAC4 |
| 64 | KNCK | KENTUCKIANA TRUCKING INC | | | SCAC4 |
| 65 | KNCL | KINGSLEY NAVIGATION CO LTD | | | SCAC3 |
| 66 | KNCP | KENTON CRATE & PALLET COMPANY INC | | | SCAC3 |
| 67 | KNCP | KARNAK CORPORATION | | | SCAC4 |
| 68 | KNCQ | KINCADE, ALLEN TRKG CO | | | SCAC3 |
| 69 | KNCQ | KEEN CUSTOM INC | | | SCAC4 |
| 70 | KNCR | KENDALL CARTAGE CO | | | SCAC3 |
| 71 | KNCS | K & C TRANSPORTATION SERVICES | | | SCAC3 |
| 72 | KNCS | KNIGHT CONSTRUCTION AND SUPPLY INC | | | SCAC4 |
| 73 | KNCT | KINCAID TRUCKING | | | SCAC3 |
| 74 | KNCW | K & C TRANSPORTATION | | | SCAC3 |
| 75 | KNCX | Koch Nitrogen Co. | added 7/2003; 7/2005; eliminated 10/2009 | | NAKINA |
| 76 | KNCX | *(WAS FLIX BANKRUPT FARMLAND IND.) | | | PWRC |
| 77 | KNCX | +KOCH NITROGEN CO. | | | PWRC |
| 78 | KNCX | KOCH NITROGEN COMPANY | | | SCAC4 |
| 79 | KNCZ | KNOX COUNTY CO-OP | | | PWRC |
| 80 | KND | Kannithi Aviation Company Limited d/b/a Kan Air | IATA: K8, Callsign: Kannithi Air, | T | AVCODES |
| 81 | KNDA | K N DOMESTIC AIR FREIGHT INC | | | SCAC3 |
| 82 | KNDA | KNAP & DAVIES ENTERPRISES | | | SCAC4 |
| 83 | KNDC | KINSDALE CARRIERS INC | | | SCAC3 |
| 84 | KNDC | KINSDALE CARRIERS INC | | | SCAC4 |
| 85 | KNDE | KNIGHT'S DELIVERY SERVICE, INC | | | SCAC3 |
| 86 | KNDJ | KNOLL, D J TRANSPORT LTD | | | SCAC4 |
| 87 | KNDL | KENDA LOGISTICS | | | SCAC4 |
| 88 | KNDN | KNUDSEN, LARRY | | | SCAC3 |
| 89 | KNDN | KINCAID, DONALD JAMES | | | SCAC4 |
| 90 | KNDO | KANDEL TRANSPORT INC | | | SCAC3 |
| 91 | KNDO | KANDEL TRANSPORT INC | | | SCAC4 |
| 92 | KNDQ | K & D TRUCK LINES | | | SCAC3 |
| 93 | KNDR | KENDRA INC | | | SCAC3 |
| 94 | KNDS | K N DISTRIBUTORS | | | SCAC3 |
| 95 | KNDS | KNUDSON DEDICATED INC | | | SCAC4 |
| 96 | KNDU | KUEHNE AND NAGEL OVERSEAS, INC. | | | SCAC3 |
| 97 | KNDU | KUEHNE AND NAGEL OVERSEAS INC | | | SCAC4 |
| 98 | KNDV | KENDALL, DAVE | | | SCAC4 |
| 99 | KNDX | KND Rail Services, Inc. | added 1/1997; 7/2000; eliminated 7/2001; 7/2005 (not listed) | | NAKINA |
| 100 | KNDX | Golden State Metals, Inc. | added 4/1976; 1/1980; eliminated 4/1989 | | NAKINA |
