| 1 | KLR | Columbus Air Transport, Inc. | Callsign: Kay-Ler, | USA | AVCODES |
| 2 | KLR | Columbus Air Transport | | | ICAO1 |
| 3 | KLRB | KILROY BROS INC | | | SCAC3 |
| 4 | KLRC | KELLER TRUCKING | | | SCAC3 |
| 5 | KLRE | KELVIN RESOURCE LIMITED | | | SCAC3 |
| 6 | KLRF | KELLER FARMS | | | SCAC4 |
| 7 | KLRG | KAHL, ROGER TRUCKING | | | SCAC3 |
| 8 | KLRH | KLR TRANSPORT INC | | | SCAC3 |
| 9 | KLRI | KLAMATH RECI INC | | | SCAC3 |
| 10 | KLRI | K L R TRANSPORT INC | | | SCAC4 |
| 11 | KLRK | KLEIN TRUCKING INC | | | SCAC3 |
| 12 | KLRK | K L & T TRUCKING LLC | | | SCAC4 |
| 13 | KLRP | KLAMATH RIVER TRANSPORTATION INC | | | SCAC3 |
| 14 | KLRQ | KELLER, JOHN D & SONS | | | SCAC3 |
| 15 | KLRS | KELLER SPECIALIZED TRANSPORT INC | | | SCAC3 |
| 16 | KLRS | KELLER FARMS | | | SCAC4 |
