| 1 | BKT | British Airtours Ltd. | IATA: KT, Callsign: Beetours, ICAO designator changed to CKT / Name changed to Caledonian Airways | GB | AVCODES |
| 2 | BKT | TAB Charters (Pty) Ltd. | Callsign: Blacktail, | ZA | AVCODES |
| 3 | BKTA | BECKER TRANSPORTATION INC | | | SCAC4 |
| 4 | BKTAG | BK Tåg Sverige AB | BK Tåg was one of the first private operators in Sweden. They started with passenger trains, but later freight trains followed. In March 2005 the passenger division of BK Tåg went bankrupt. The services operated by them (the Krösatågen network centered around Nässjö and Linköping-Kalmar/Västervik) were suspended. Freight services, like Oskarshamn-Silverdalen (wood) and Åhus/Karlstad-Göteborg (container train) are still operated and will continue in the future. | S | TRAFFIC |
| 5 | BKTB | BARKER TRANSPORTATION | | | SCAC3 |
| 6 | BKTC | BERKS TRANSPORTATION COMPANY | | | SCAC3 |
| 7 | BKTC | BAKER, TIM TRUCKING LLP | | | SCAC4 |
| 8 | BKTE | BUCK TRUCKING CO INC | | | SCAC3 |
| 9 | BKTF | BAKER TRANSFER COMPANY | | | SCAC3 |
| 10 | BKTF | BK TRANSPORTATION INC | | | SCAC4 |
| 11 | BKTG | BERKELEY TRUCKING CO INC | | | SCAC3 |
| 12 | BKTG | BERKELEY EXPRESS INC | | | SCAC4 |
| 13 | BKTH | BLAKEMAN TRUCKING CO INC | | | SCAC3 |
| 14 | BKTI | BORK TRANSPORT INC | | | SCAC3 |
| 15 | BKTI | BORK TRANSPORT OF ILLINOIS | | | SCAC4 |
| 16 | BKTJ | BRUKETTA, JOHN INC | | | SCAC3 |
| 17 | BKTJ | BOYLE, K TRUCKING INC | | | SCAC4 |
| 18 | BKTK | BARKER TRUCKING | | | SCAC4 |
| 19 | BKTL | B & K TRUCK LINES LTD | | | SCAC3 |
| 20 | BKTL | BURKHOLDER, K & T TRUCKING | | | SCAC4 |
| 21 | BKTN | BROCKTON INC | | | SCAC4 |
| 22 | BKTO | BURKE TRUCKING INC | | | SCAC4 |
| 23 | BKTP | BROOKS TRANSPORT INC | | | SCAC3 |
| 24 | BKTQ | BULK TRANSPORTERS INC | | | SCAC3 |
| 25 | BKTQ | BULK TRANSPORTERS INC | | | SCAC4 |
| 26 | BKTR | B & K TRUCKING INC | | | SCAC4 |
| 27 | BKTS | BULK TRANSIT CORPORATION | | | SCAC3 |
| 28 | BKTV | BOOKER TRANSPORTATION SERVICES LLC | | | SCAC4 |
| 29 | BKTW | B & K TRUCKING | | | SCAC3 |
| 30 | BKTW | BEMAK TRAFFIC SERVICES INC | | | SCAC4 |
| 31 | BKTY | Union Pacific R.R. Co. | added 4/1997; 7/2000-7/2005 | | NAKINA |
| 32 | BKTY | Missouri Pacific System | added 1/1990; 1/1994; eliminated 4/1997 | | NAKINA |
| 33 | BKTY | Missouri-Kansas-Texas R.R. Co. | 10/1966-1/1980; eliminated 1/1990 | | NAKINA |
| 34 | BKTY | Missouri Pacific System | added 1/90; 1/94; eliminated 4/97 | | NRHS |
| 35 | BKTY | Missouri-Kansas-Texas R.R. Co. | 10/66-1/80; eliminated 1/90 | | NRHS |
| 36 | BKTY | Union Pacific R.R. Co. | added 4/97; 7/2000 | | NRHS |
| 37 | BKTY | UNION PACIFIC [MISSOURI PACIFIC] [MISSOURI-KANSAS-TEXAS RR.] | | | PWRC |
| 38 | BKTY | Missouri-Kansas-Texas Railroad (Union Pacific Railroad) | | | RSRV |
