| 1 | KOS | Kosovaair | Callsign: Kosova, | YU | AVCODES |
| 2 | KOS | Kosova Airlines | | | ICAO1 |
| 3 | KOS | Krnovské opravny a strojírny spol. s r.o. | | CZ | VKM |
| 4 | KOSA | KOKUKA SANGYO CO LTD | | | SCAC4 |
| 5 | KOSAKA | Kosaka Smelting & Refining | | J | TRAFFIC |
| 6 | KOSAKR | Kosaka Railway | | J | TRAFFIC |
| 7 | KOSB | KOSTER, BRUCE TRUCKING | | | SCAC3 |
| 8 | KOSC | KOSCO TRUCKING INC | | | SCAC3 |
| 9 | KOSC | KOSCO TRUCKING INC | | | SCAC4 |
| 10 | KOSE | KOBACKER STORES INC | | | SCAC3 |
| 11 | KOSE | KOBACKER STORES INC | | | SCAC4 |
| 12 | KOSG | KOSA, GEORGE A INC | | | SCAC3 |
| 13 | KOSI | KODIAK OIL SALES INC | | | SCAC3 |
| 14 | KOSK | KOSKI TRUCKING INC | | | SCAC3 |
| 15 | KOSKO | Kosko | City: Varna | BG | TRAFFIC |
| 16 | KOSL | KING OCEAN SERVICES LIMITED INC | | | SCAC4 |
| 17 | KOSN | KENS OIL SERVICE INC | | | SCAC4 |
| 18 | KOSP | KEMO-SABE EXPRESS INC | | | SCAC3 |
| 19 | KOSP | KLACKO SPARS | | | SCAC4 |
| 20 | KOSQ | KOS SHIPPING COMPANY | | | SCAC3 |
| 21 | KOSR | KOSAREFF, P J | | | SCAC3 |
| 22 | KOSR | KOSSAR TRANSPORTATION INC | | | SCAC4 |
| 23 | KOSS | KLOSS TRUCKING | | | SCAC4 |
| 24 | KOST | KOSMOS TOWING COMPANY INC | | | SCAC3 |
| 25 | KOST | KOS Trading, akciová společnost | | CZ | VKM |
| 26 | KOSU | KING OCEAN SERVICES LTD | | USA | BIC |
| 27 | KOSU | King Ocean Services | | | RSRV |
| 28 | KOSU | KING OCEAN SERVICES LTD | | | SCAC4 |
| 29 | KOSW | KINGS OCEAN SHIPPING CO LTD | | | SCAC4 |
| 30 | KOSZ | MZK Koszalin | | PL | TRAFFIC |
