| 1 | KLO | Flight-Ops International, Inc. t/a Skyxpress Airline | Callsign: Klondike, Ceased operations in November 2008 due to the financial crisis. | CDN | AVCODES |
| 2 | KLO | Flight-Ops International | | | ICAO1 |
| 3 | KLOA | KBG LOGISTICS | | | SCAC4 |
| 4 | KLOC | KS LOGISTICS INC | | | SCAC4 |
| 5 | KLOCK | Klöckner-Werke Bremen | | D | TRAFFIC |
| 6 | KLOD | KLD LOGISTICS | | | SCAC4 |
| 7 | KLOE | KELRON TRANSPORTATION MANAGEMENT IN | | | SCAC4 |
| 8 | KLOF | KLOEPFER INC | | | SCAC3 |
| 9 | KLOG | KOCH LOGISTICS (DIV OF STAN KOCH & | | | SCAC4 |
| 10 | KLOI | KELLERSTRASS OIL CO | | | SCAC4 |
| 11 | KLOJ | KENNEDY LOGISTICS OF ILLINOIS (INTE | | | SCAC4 |
| 12 | KLOK | KLOKE MOVERS | | | SCAC4 |
| 13 | KLOL | KLASEN OIL COMPANY INC | | | SCAC4 |
| 14 | KLOM | KP LOGIEM | | | SCAC4 |
| 15 | KLON | KALONIAL TRANSPORT LTD | | | SCAC4 |
| 16 | KLOP | KELLER, L OIL PROPERTIES INC | | | SCAC3 |
| 17 | KLOP | KLOS LOGISTICS INC | | | SCAC4 |
| 18 | KLOQ | KINGDOM LOGISTICS | | | SCAC4 |
| 19 | KLOR | KALCO RECOVERY INC | | | SCAC3 |
| 20 | KLOS | KLOSE, H L & SONS INC | | | SCAC4 |
| 21 | KLOSOK | Przedsiębiorstwo Produkcyjno-Usługowo-Handlowe „Kłosok” Andrzej Kłosok | | PL | TRAFFIC |
| 22 | KLOT | KLOS TRUCKING INC | | | SCAC4 |
| 23 | KLOU | KLOIBER GMBH | | D | BIC |
| 24 | KLOU | KLOIBER GMBH | | | SCAC4 |
| 25 | KLOW | KLOCKWERKS | | | SCAC4 |
| 26 | KLOY | KLR LOGISTICS | | | SCAC4 |
