| 1 | KB | Druk Air Corporation Ltd. | ICAO: DRK, Callsign: Royal Bhutan, IATA Prefix: 787, | BTN | AVCODES |
| 2 | KB | Burnthills Aviation Ltd. | | GB | AVCODES |
| 3 | KB | Kenya Aircharters Limited | Callsign: Kencharter, | EAK | AVCODES |
| 4 | KB | Cadabo Gestione Servizi Aeronautici | Callsign: Cadabo, | I | AVCODES |
| 5 | KB | Kalvehavebanen | 1897 - 1959 | DK | jernbanen.dk |
| 6 | KB | Kalvehavebanen | 1897 - 1959 | DK | TRAFFIC |
| 7 | KB | Kullmann Bauservice GmbH | | DE | VKM |
| 8 | KBA | Kenn Borek Air Ltd. | IATA: 4K, Callsign: Borek Air, Designator 4K recalled by IATA | CDN | AVCODES |
| 9 | KBA | Kenn Borek Air Ltd. | Callsign: Borek Air, Designator 4K recalled by IATA | CDN | AVCODES |
| 10 | KBA | Kenn Borek Air | | | ICAO1 |
| 11 | KBAA | K & B LOGISTICS LLC | | | SCAC4 |
| 12 | KBAD | KLASSEN, BILL AUCTIONS LTD | | | SCAC4 |
| 13 | KBAL | KOLB, AL TRUCKING | | | SCAC3 |
| 14 | KBAP | KB TRANSPORTATION | | | SCAC4 |
| 15 | KBAQ | KILLEBREW, BOB A | | | SCAC3 |
| 16 | KBAQ | KILLEBREW TRUCKING SERVICE | | | SCAC4 |
| 17 | KBB | Deutsche Gesellschaft für Eisenbahngeschichte e.V | | DE | VKM |
| 18 | KBBG | K B BROKERAGE | | | SCAC4 |
| 19 | KBBS | KBBS CONVOY | | | SCAC3 |
| 20 | KBBS | KB FREIGHT SYSTEMS | | | SCAC4 |
| 21 | KBBT | KERBS BROS TRUCKING | | | SCAC3 |
| 22 | KBBT | KBK TRANSPORTES | | | SCAC4 |
| 23 | KBC | KERRVILLE BUS COMPANY | | | SCAC4 |
| 24 | KBC | Kobe Municipal Subway | | J | TRAFFIC |
| 25 | KBCA | KC BUILDERS COMPANY LLC | | | SCAC4 |
| 26 | KBCI | KELLEY BROTHERS CONTRACTORS INC | | | SCAC3 |
| 27 | KBCO | KABECO (DIV AMERICAN TRANSPORT INC) | | | SCAC3 |
| 28 | KBCP | K B COMPANY INC | | | SCAC3 |
| 29 | KBCQ | KIMBLE CARTAGE INC | | | SCAC4 |
| 30 | KBCT | KNAPP, BRUCE C TRUCKING | | | SCAC3 |
| 31 | KBCT | KBC TOOLS INC | | | SCAC4 |
| 32 | KBCZ | KELLEY BEAN COMPANY | | | PWRC |
| 33 | KBD | JetKey | Callsign: Jet Key, | F | AVCODES |
| 34 | KBDS | KBD SERVICES INC | | | SCAC3 |
| 35 | KBDS | KIRBY, DAVE TRANSPORT INC | | | SCAC4 |
| 36 | KBE | Köln-Bonner Eisenbahnen AG | City: Köln | D | TRAFFIC |
| 37 | KBEC | Kent, Barry, Eaton Connecting Ry., Inc. | added 4/1980; eliminated 1/1984 | | NAKINA |
| 38 | KBEC | Kent, Barry, Eaton Connecting Ry., Inc. | added 4/80 | | NRHS |
| 39 | KBEC | KENT, BARRY, EATON CONNECTING RAILWAY CO. | | | PWRC |
| 40 | KBEF | Köln-Bonner Eisenbahnfreunde e.V. | Köln | D | privat-bahn.de |
| 41 | KBEF | Köln-Bonner Eisenbahn -Freunde e.V | | DE | VKM |
| 42 | KBEI | K B EXPRESS INC | | | SCAC4 |
| 43 | KBEL | KBEL TRANSPORT | | | SCAC4 |
| 44 | KBEN | KREITZ, J & H TRANSPORT | | | SCAC4 |
| 45 | KBEP | KB EXPRESS | | | SCAC4 |
| 46 | KBEV | KINGSBURY ELEVATOR INC | | | SCAC4 |
| 47 | KBF | Korsnäs AB, Produktion Frövi | | SE | VKM |
| 48 | KBFC | KLEBE FUEL CO INC | | | SCAC4 |
| 49 | KBFL | K & B FREIGHT LINE | | | SCAC3 |
| 50 | KBFL | K B CORPORATION | | | SCAC4 |
| 51 | KBFP | K B FUEL CORP | | | SCAC4 |
| 52 | KBFS | K&B FREIGHT SYSTEMS, AMJES, INC | | | SCAC3 |
| 53 | KBG | Korsnäs AB, Produktion Gävle | | SE | VKM |
| 54 | KBGA | KOMROWSKI | | | SCAC4 |
| 55 | KBGT | KLINGBERG TRUCKING INC | | | SCAC4 |
| 56 | KBHI | KBH INC | | | SCAC3 |
| 57 | KBHI | KEBO TRANSPORTATION SERVICES INCORP | | | SCAC4 |
| 58 | KBIB | KITS BROKERAGE INC | | | SCAC4 |
| 59 | KBIC | KENNAMER BROTHERS INC | | | SCAC4 |
| 60 | KBID | KNIGHT BROKERAGE LLC (INTERMODAL DI | | | SCAC4 |
| 61 | KBIM | KIRBY INLAND MARINE | | | SCAC4 |
| 62 | KBIN | KC BROTHERS INC | | | SCAC4 |
| 63 | KBJ | Kävlinge - Barsebäck Järnväg | 1907 - 1927 | S | svenska-lok.se |
| 64 | KBJS | KBJ SYSTEMS INC | | | SCAC4 |
| 65 | KBKF | KIMBROOKE FARM | | | SCAC4 |
| 66 | KBKO | KENNEDY BROTHERS INC | | | SCAC4 |
| 67 | KBKS | KISSEL CABBAGE CORPORATION | | | SCAC4 |
| 68 | KBKX | Carey, Baxter and Kennedy, Inc. | 7/1937-4/1961 (not listed) | | NAKINA |
| 69 | KBKX | Carey, Baxter and Kennedy, Inc. | 1/52-4/61 | | NRHS |
| 70 | KBKX | CAREY, BAXTER & KENNEDY, INC. | | | PWRC |
| 71 | KBL | Kabul Air Company | Callsign: Kabul Air, | AFG | AVCODES |
| 72 | KBL | Kleinbahn Leeste e.V. | Leeste | D | privat-bahn.de |
| 73 | KBL | KOBUSSEN BUSES LTD | | | SCAC4 |
| 74 | KBLF | KNOBLOCH FARMS TRUCKING INC | | | SCAC3 |
| 75 | KBLG | K B LOGISTICS INC | | | SCAC4 |
| 76 | KBLI | KLEEN BLAST DIVISION CANAM | | | SCAC4 |
| 77 | KBLM | KB LOGISTICS MANAGEMENT INC | | | SCAC4 |
| 78 | KBLP | KBL TRANSPORT INC | | | SCAC4 |
| 79 | KBLQ | K-BAR LIVESTOCK TRANSPORT INC | | | SCAC3 |
| 80 | KBLQ | KIMBALL FARM FEEDS 2 INC | | | SCAC4 |
| 81 | KBLR | KBL TRANSPORTATION INC | | | SCAC4 |
| 82 | KBLS | K B LEASING | | | SCAC3 |
| 83 | KBLT | KIMBERLAIN TRUCKING INC | | | SCAC3 |
| 84 | KBLT | K & B TRANSPORT INC | | | SCAC4 |
| 85 | KBLV | KURTENBACH LIVESTOCK LLC | | | SCAC4 |
| 86 | KBLX | CanAM Minerals, Inc. | added 10/2006; eliminated 4/2008 | | NAKINA |
| 87 | KBLX | CANAM MINERALS, INC. | | | PWRC |
| 88 | KBLX | CANAM MINERALS INC | | | SCAC4 |
| 89 | KBME | KBM EQUIPMENT REPAIR INC | | | SCAC4 |
| 90 | KBMF | KBM FORESTRY CONSULTANTS INC | | | SCAC4 |
| 91 | KBMG | KBM TRUCKING | | | SCAC4 |
| 92 | KBMH | KELSO, BOB MOBILE HOME TRANSPORT AN | | | SCAC3 |
| 93 | KBML | KNIGHTS BUILDING MATERIALS INC | | | SCAC3 |
| 94 | KBMS | KONICA BUSINESS MACHINES U S A INC | | | SCAC3 |
| 95 | KBMT | K B M TRANSPORT INC | | | SCAC3 |
| 96 | KBMW | KAPTANOGLU BROTHERS MARITIME LTD | | | SCAC4 |
| 97 | KBN | Sriracha Aviation Co. Ltd. | Callsign: Kabin, | T | AVCODES |
| 98 | KBNA | KARR, BUD & ASSOCIATES INC | | | SCAC3 |
| 99 | KBO | Aero Tours (Newcastle) Ltd. | Callsign: Tyne, | GB | AVCODES |
| 100 | KBOS | K & B OIL SUPPLY INC | | | SCAC4 |
