| 1 | KRL | Kryla | Callsign: Citadel Air, Ceased operations. | UA | AVCODES |
| 2 | KRL | Kasgro Rail Lines | added 10/2000; 7/2005 | | NAKINA |
| 3 | KRL | Kasgro Rail Lines | added 10/2000 | | NRHS |
| 4 | KRL | KASGRO RAIL LINES | | | PWRC |
| 5 | KRL | Kasgro Rail Lines | | | RSRV |
| 6 | KRL | KASGRO RAIL LINES | | | SCAC4 |
| 7 | KRLA | KESTER RACING LLC | | | SCAC4 |
| 8 | KRLC | KISTNER RESOURCES LLC | | | SCAC4 |
| 9 | KRLG | K & R LOG & LUMBER CO INC | | | SCAC3 |
| 10 | KRLK | KREILKAMP TRUCKING, INC | | | SCAC3 |
| 11 | KRLK | KREILKAMP TRUCKING INC | | | SCAC4 |
| 12 | KRLL | KERRY LIMOUSINE LTD | | | SCAC3 |
| 13 | KRLL | KARL, LARRY M TRUCKING INC | | | SCAC4 |
| 14 | KRLN | KARLIN NAVIGATION LTD | | | SCAC4 |
| 15 | KRLQ | KTR LOGISTICS | | | SCAC4 |
| 16 | KRLT | KARLS TRANSPORT INC | | | SCAC3 |
| 17 | KRLT | KARLS TRANSPORT INC | | | SCAC4 |
| 18 | KRLU | DP WORLD RAIL LOGISTICS PRIVATE LIMITED | | IND | BIC |
| 19 | KRLV | KRALEVICH TRUCKING INC | | | SCAC4 |
| 20 | KRLX | National Car Co. | 4/1947-1/1950 | | NAKINA |
| 21 | KRLX | Kingan Refrigerator Line | 8/1920-1/1941 | | NAKINA |
| 22 | KRLX | Kingan Refrigerator Line | Apr-38 | | NRHS |
| 23 | KRLX | *KINGAN REFRIGERATOR LINE | | | PWRC |
| 24 | KRLX | *NATIONAL CAR CO. | | | PWRC |
| 25 | KRLX | KEYSTONE RAILCAR INC | | | SCAC4 |
