| 1 | K | Ansett Australia | AUS | TRAFFIC | |
| 2 | K&E | Kentwood & Eastern Ry. Co. | 8/1920 | NAKINA | |
| 3 | K&E | KENTWOOD & EASTERN RWY. CO. | PWRC | ||
| 4 | K&M | Kanawha & Michigan Ry. (New York Central R.R.) | 7/1930-7/1932 | NAKINA | |
| 5 | K&M | Kanawha & Michigan Ry. (New York Central R.R.—Ohio Central Lines) | 7/1923 | NAKINA | |
| 6 | K&M | Kanawha & Michigan Ry. Co. | 8/1920 | NAKINA | |
| 7 | K&M | NEW YORK CENTRAL RAILROAD [KANAWHA & MICHIGAN RWY. CO.] | PWRC | ||
| 8 | K&T | Kentucky & Tennessee Ry. | 7/1923-7/1936 | NAKINA | |
| 9 | K&T | KENTUCKY & TENNESSEE RAILWAY CO. | PWRC | ||
| 10 | K&WV | Kanawha & West Virginia R.R. (New York Central R.R.) | 7/1930 | NAKINA | |
| 11 | K&WV | Kanawha & West Virginia R.R. (New York Central R.R.—Ohio Central Lines) | 7/1923 | NAKINA | |
| 12 | K&WV | Kanawha & West Virginia R.R. Co. (Kanawha & Michigan Ry.) | 8/1920 | NAKINA | |
| 13 | K&WV | NEW YORK CENTRAL RAILROAD [KANAWHA & MICHIGAN RWY.; KANAWHA & WEST VIRGINIA RAILROAD CO.] | PWRC | ||
| 14 | KA | Franz Kassecker GmbH | DE | VKM | |
| 15 | KAA | Asia Aero Survey and Consulting Engineers | ICAO1 | ||
| 16 | KAABS | Kaabs Nordic AB | SE | VKM | |
| 17 | KAAD | KANADA CARRIERS | SCAC3 | ||
| 18 | KAAK | KAAKE TRUCKING COMPANY | SCAC3 | ||
| 19 | KAAL | KAALBYE SHIPPING UKRAINE | SCAC4 | ||
| 20 | KAAN | K A TRUCKING COMPANY | SCAC3 | ||
| 21 | KAAN | KRUSNIAK, ANTHONY | SCAC4 | ||
| 22 | KAAQ | KLECKER AND ANDERSON | SCAC3 | ||
| 23 | KAAR | KALITTA AIR LLC | SCAC4 | ||
| 24 | KABA | K A BAIT LTD | SCAC4 | ||
| 25 | KABB | KAB-8 INC | SCAC4 | ||
| 26 | KABD | KAIBAB DISTRIBUTION CORPOORTATION | SCAC3 | ||
| 27 | KABG | KAMLOOPS AUGERING & BORING LTD | SCAC4 | ||
| 28 | KABH | KALBACH, C H TRUCKING | SCAC3 | ||
| 29 | KABI | KAIBAB TRANSPORTATION INC | SCAC3 | ||
| 30 | KABI | KABAILCO INC | SCAC4 | ||
| 31 | KABL | KABLE BROTHERS TRANSPORT | SCAC3 | ||
| 32 | KABM | KORTSCH, A B C MOVING & STORAGE INC | SCAC3 | ||
| 33 | KABM | KAPA LOGISTICS LTD | SCAC4 | ||
| 34 | KABO | KABECO INC | SCAC3 | ||
| 35 | KABO | KAILE7 TRANSPORT INC | SCAC4 | ||
| 36 | KABQ | KABBES TURCKING | SCAC3 | ||
| 37 | KABQ | KCLA TRANSPORTATION | SCAC4 | ||
| 38 | KABR | K AND B TRANSPORTATION LLC | SCAC4 | ||
| 39 | KABX | Canadian Resource Distribution Inc. | 7/2000-7/2005 (not listed) | NAKINA | |
| 40 | KABX | Kaber Co. | 1/1994 (not listed) | NAKINA | |
| 41 | KABX | Bay State Milling Co. | eliminated 10/1993 | NAKINA | |
| 42 | KABX | Kaber Co. | 1/1975; added 4/1975; 1/1980; eliminated 7/1993 | NAKINA | |
| 43 | KABX | Kaber Co. | 1/75; added 4/75; 1/80; eliminated 7/93 | NRHS | |
| 44 | KABX | Bay State Milling Co. | eliminated 10/93 | NRHS | |
| 45 | KABX | Kaber Co. | Jan-94 | NRHS | |
| 46 | KABX | Canadian Resource Distribution Inc. | Jul-00 | NRHS | |
| 47 | KABX | *RETIRED 08-25-93 ATP [BAY STATE MILLING; kABER CO.] | PWRC | ||
| 48 | KABX | +CANADIAN RESOURCE DISTRIBUTION INC | PWRC | ||
| 49 | KABX | Kaber Canadian Resource Distribution | RSRV | ||
| 50 | KABX | CANADIAN RESOURCE DISTRIBUTION INC | SCAC4 | ||
| 51 | KAC | Kuwait Airways | IATA: KU | ICAO1 | |
| 52 | KACA | A-KALALA TRANSPORT LTD | SCAC4 | ||
| 53 | KACE | KATH, CARL E JR | SCAC3 | ||
| 54 | KACF | K & C FREIGHTWAYS INC | SCAC3 | ||
| 55 | KACG | K & C GRAIN | SCAC3 | ||
| 56 | KACH | KAISER CHEMICALS | PWRC | ||
| 57 | KACH | KACHINA TRANSPORTATION | SCAC3 | ||
| 58 | KACH | KACHAN, RANDY | SCAC4 | ||
| 59 | KACI | KARON CARRIER INC | SCAC3 | ||
| 60 | KACL | KACE LOGISTICS INC | SCAC4 | ||
| 61 | KACN | KANSAS AIR CENTER INC | SCAC4 | ||
| 62 | KACR | KACH TRANSPORTATION | SCAC3 | ||
| 63 | KACR | KACH TRANSPORTATION INC | SCAC4 | ||
| 64 | KACT | K & C TRUCKING CO INC | SCAC3 | ||
| 65 | KACT | K & C TRUCKING CO INC | SCAC4 | ||
| 66 | KACU | CASPIAN CONTAINER LINE LLC | SCAC4 | ||
| 67 | KACV | KACHARAVA SHIPPING COMPANY LTD | SCAC3 | ||
| 68 | KACV | K T TRANSPORTATION | SCAC4 | ||
| 69 | KACX | Kaiser Aluminum & Chemical Corp. | added 4/1959; 4/1961-1/1994; eliminated 7/1994; 7/2000-7/2005 (not listed) | NAKINA | |
| 70 | KACX | Kaiser Aluminum & Chemical Corp. | 4/61-1/94; eliminated 7/94; 7/2000 | NRHS | |
| 71 | KACX | KAISER ALUMINUM & CHEMICAL CORP. | PWRC | ||
| 72 | KACX | Kaiser Aluminum and Chemical Corporation | RSRV | ||
| 73 | KACX | KAISER ALUMINUM & CHEMICAL CORP | SCAC3 | ||
| 74 | KACX | KAISER ALUMINUM & CHEMICAL CORP | SCAC4 | ||
| 75 | KACY | KELLER, ALLEN COMPANY | SCAC4 | ||
| 76 | KAD | Air Kirovograd | ICAO1 | ||
| 77 | KADC | K & D TRUCKING COMPANY LTD | SCAC3 | ||
| 78 | KADE | KADER TRANSPORT | SCAC4 | ||
| 79 | KADL | KARDELL LEASING CO | SCAC3 | ||
| 80 | KADL | KANES DISTRIBUTING LIMITED | SCAC4 | ||
| 81 | KADN | KA DON ENTERPRISE LTD | SCAC3 | ||
| 82 | KADQ | K AND D TRUCKLINES | SCAC3 | ||
| 83 | KADR | KADER COMPANY INC | SCAC3 | ||
| 84 | KAE | Kartika Airlines | ICAO1 | ||
| 85 | KAEI | K & A EXPRESS INC | SCAC4 | ||
| 86 | KAEJ | KANE FREIGHT LINES INC | SCAC3 | ||
| 87 | KAEJ | KANE FREIGHT LINES INC | SCAC4 | ||
| 88 | KAEM | K & E MOVING & STORAGE | SCAC3 | ||
| 89 | KAEP | KLASS ACT EXPRESS | SCAC4 | ||
| 90 | KAET | KAETS TRANSPORT INC | SCAC3 | ||
| 91 | KAF | KAF Falkenhahn Bau AG | DE | VKM | |
| 92 | KAFB | KAFKA BROS, INC | SCAC3 | ||
| 93 | KAFC | KAFCO DE MEXICO SA DE CV | SCAC4 | ||
| 94 | KAFF | KAUFFMAN, JAMES M | SCAC3 | ||
| 95 | KAFL | KNIGHTS APPLEDEN FRUIT LIMITED | SCAC4 | ||
| 96 | KAFM | KAUFMAN GRAIN COMPANY | SCAC3 | ||
| 97 | KAFR | KAFER, MAX CORP | SCAC3 | ||
| 98 | KAFS | KAUFFS TRANSPORTATION SYSTEMS | SCAC3 | ||
| 99 | KAFTT | Falkenbahn Baugesellschaft mbH | DE | VKM | |
| 100 | KAGC | K & G CARTAGE | SCAC3 |