| 1 | KS | Peninsula Airways, Inc. t/a PenAir | ICAO: NLA, Callsign: Peninsula, IATA Prefix: 339, IATA designator KS recalled by IATA. | USA | AVCODES |
| 2 | KS | Casair Aviation Services Ltd. | | GB | AVCODES |
| 3 | KS | Saturn Airways, Inc. | Callsign: Saturn, | USA | AVCODES |
| 4 | KS | Casair Aviation Ltd. | ICAO: CSL, Callsign: Casair, | GB | AVCODES |
| 5 | KS | Air Connect Aviation Group | ICAO: KON, Callsign: Air Connect, Plans to launch flights with an ATR72-600 turboprop in May 2022. | RO | AVCODES |
| 6 | KS | Kolding Sydbaner | 1911 - 1948 | DK | jernbanen.dk |
| 7 | KS | KANSAS CITY STAR | | | PWRC |
| 8 | KS | Kobenhavns Sporveje | City: Koppenhagen | DK | TRAFFIC |
| 9 | KS | KOTOUČ ŠTRAMBERK, spol. s r.o. | | CZ | VKM |
| 10 | KSA | Sud Aerocargo | Callsign: Sudcargo, | MD | AVCODES |
| 11 | KSA | KS Avia | Callsign: Sky Camel, | LV | AVCODES |
| 12 | KSA | K S Avia | | | ICAO1 |
| 13 | KSAF | KOSTER, ALFRONS AND CO. | | | SCAC3 |
| 14 | KSAG | KOWALSKI SAUSAGE CO | | | SCAC4 |
| 15 | KSAK | KRITSAK TRUCKING | | | SCAC4 |
| 16 | KSAN | K S ATHWAL TRANSPORT INC | | | SCAC4 |
| 17 | KSAS | KONKAR SHIPPING AGENCIES S A | | | SCAC3 |
| 18 | KSAS | KONKAR SHIPPING AGENCIES S A | | | SCAC4 |
| 19 | KSAT | KOCTUG SHIPPING & TRADING INC | | | SCAC3 |
| 20 | KSAT | K/S ALTAIR SHIPPING | | | SCAC4 |
| 21 | KSAT | Kushiro Satellite Co. Ltd. | | J | TRAFFIC |
| 22 | KSAU | KSAN SIA | | LV | BIC |
| 23 | KSAU | KSAN SIA | | | SCAC4 |
| 24 | KSAV | KEY STATE AG SERVICE | | | SCAC4 |
| 25 | KSAY | KING STAR TRUCKING LTD | | | SCAC4 |
| 26 | KSB | København - Slangerup Banen (Slangerupbanen) | 1906 - 1948 | DK | jernbanen.dk |
| 27 | KSB | København - Slangerup Banen (Slangerupbanen) | 1906 - 1948 | DK | TRAFFIC |
| 28 | KSBI | KOCH SCHOOL BUS SERVICE INC | | | SCAC4 |
| 29 | KSBK | KEYSTONE BULK TRANSPORT LTD | | | SCAC3 |
| 30 | KSBK | K & J LOGISTICS INC | | | SCAC4 |
| 31 | KSBL | KICKERT SCHOOL BUS LINE INC | | | SCAC3 |
| 32 | KSBS | KEYSTONE BUS SERVICE INC | | | SCAC3 |
| 33 | KSBU | GUANGDONG BESTCON INTELLIGENT EQUIPMENT CO., LTD. | | PRC | BIC |
| 34 | KSBW | K & S BONDED WAREHOUSE INC | | | SCAC3 |
| 35 | KSC | Krajowa Spółka Cukrowa S.A. | | PL | VKM |
| 36 | KSCA | K & S TRANSPORT INC | | | SCAC4 |
| 37 | KSCB | KB & SONS CARRIER LTD | | | SCAC4 |
| 38 | KSCC | KANSAS CITY COLD STORAGE DISTRIBUTION INC. | | | PWRC |
| 39 | KSCC | KANSAS CITY COLD STORAGE DISTRIBUTI | | | SCAC3 |
| 40 | KSCC | KOL GLOBAL LOGISTICS SERVICES | | | SCAC4 |
| 41 | KSCD | KYOWA SHIPPING CO LTD | | | SCAC3 |
| 42 | KSCD | K-SOURCE CANADA LTD | | | SCAC4 |
| 43 | KSCE | KANSAS CITY EXPRESS | | | SCAC3 |
| 44 | KSCF | KLEGSTAD, SCOTT | | | SCAC4 |
| 45 | KSCH | KLEINSCHMIT TRUCKING INC | | | SCAC4 |
| 46 | KSCH | Kiel-Schönberger Eisenbahn GmbH | | D | TRAFFIC |
| 47 | KSCI | KANAWHA STONE COMPANY INC | | | SCAC4 |
| 48 | KSCL | KOMI SHIPPING COMPANY LTD LIB | | | SCAC3 |
| 49 | KSCL | KESCO CONTAINER LINE INC | | | SCAC4 |
| 50 | KSCM | KENNEDY-SIM | | | SCAC4 |
| 51 | KSCN | KOSCARGO CONSOLID CORP. | | | SCAC3 |
| 52 | KSCO | K/S COMBI LIFT | | | SCAC4 |
| 53 | KSCP | KAPALUA SHIPPING CORPORATION | | | SCAC4 |
| 54 | KSCQ | KINGS SPECIALIZED CARRIER INC | | | SCAC3 |
| 55 | KSCR | KSI | | | SCAC4 |
| 56 | KSCS | K & S CARRIERS LLC | | | SCAC4 |
| 57 | KSCT | KORSTAR SHIPPING CO LTD | | | SCAC4 |
| 58 | KSCU | KOREA SHIPPING CORPORATION | | | PWRC |
| 59 | KSCU | Korea Shipping Corporation | | | RSRV |
| 60 | KSCU | KOREA SHIPPING CORPORATION | | | SCAC3 |
| 61 | KSCX | KapStone Charleston Kraft, LLC | added 10/2008 | | NAKINA |
| 62 | KSCX | Kaiser Steel Corp. | 1/1952-7/1954; eliminated 1/1956; added 7/1966; 10/1966-1/1975; eliminated 7/1978 | | NAKINA |
| 63 | KSCX | Kentucky Solvay Coke Co. (Ashland By-Product Coke Co.) | 7/1923 | | NAKINA |
| 64 | KSCX | Kentucky Solvay Coke Co. | 8/1920 | | NAKINA |
| 65 | KSCX | Kaiser Steel Corp. | 1/52; added 7/66; 10/66-1/75; eliminated 7/78 | | NRHS |
| 66 | KSCX | *ASHLAND BY-PRODUCT COKE CO. [KENTUCKY SOLVAY COKE CO.] | | | PWRC |
| 67 | KSCX | *KAISER STEEL CO. | | | PWRC |
| 68 | KSCX | +KAPSTONE CHARLESTON KRAFT, LLC | | | PWRC |
| 69 | KSCX | KAPSTONE CHARLESTON KRAFT LLC | | | SCAC4 |
| 70 | KSCX | Kaiser Steel Corp. | | USA | TRAFFIC |
| 71 | KSCY | KOFINAS SHIPPING COMPANY LIMITED | | | SCAC3 |
| 72 | KSCY | K & S LOGISTICS INC | | | SCAC4 |
| 73 | KSCZ | KOREA SHIPPING CORPORATION | | | PWRC |
| 74 | KSCZ | Korea Shipping Corporation | | | RSRV |
| 75 | KSCZ | KOREA SHIPPING CORPORATION | | | SCAC4 |
| 76 | KSD | KAS Air Company | IATA: KW, Callsign: Aerokas, | KS | AVCODES |
| 77 | KSDI | K/S DIFKO LXVII | | | SCAC4 |
| 78 | KSDS | K & S DELIVERY SERVICE | | | SCAC3 |
| 79 | KSE | Kiel-Segeberger Eisenbahn GmbH | | D | TRAFFIC |
| 80 | KSEA | K-SEA TRANSPORTATION INC | | | SCAC4 |
| 81 | KSEC | K I S S EXPRESS CO | | | SCAC3 |
| 82 | KSEI | K & S ENTERPRISE INC | | | SCAC4 |
| 83 | KSEL | K AND S EQUIPMENT LEASING INC | | | SCAC3 |
| 84 | KSEN | KNUTSEN O A S SHIPPING A/S | | | SCAC3 |
| 85 | KSEN | KNUTSEN O A S SHIPPING A/S | | | SCAC4 |
| 86 | KSEQ | KASAN EQUIPMENT | | | SCAC3 |
| 87 | KSET | K SEA TRANSPORTATION LLC | | | SCAC4 |
| 88 | KSEU | PAPIERHAUS GMBH JESTEBURG | | D | BIC |
| 89 | KSEV | KRIEGER SEASERVICES | | | SCAC4 |
| 90 | KSEY | KASEY TRUCKING | | | SCAC3 |
| 91 | KSF | Kent State University | Callsign: Kent, | USA | AVCODES |
| 92 | KSFI | KEYSTONE FREIGHT INC | | | SCAC3 |
| 93 | KSFL | KERNVILLE STAGE & FREIGHT LINES OF | | | SCAC3 |
| 94 | KSFP | K & S FREIGHT TRANSPORT INC | | | SCAC4 |
| 95 | KSFQ | KOSSAREFF, PHIL | | | SCAC3 |
| 96 | KSFU | KING STAR FREIGHT PVT. LTD. | | IND | BIC |
| 97 | KSFY | K & S FREIGHT | | | SCAC4 |
| 98 | KSG | Kombiwaggon Servicegesellschaft | Mainz | D | privat-bahn.de |
| 99 | KSG | Kopalnie i Zakłady Chemiczne Siarki “Siarkopol” S.A. | | PL | VKM |
| 100 | KSGF | KASSENBORG, GORDON FARMS INC | | | SCAC3 |
