| 1 | BT | Air Baltic Corporation S/A | ICAO: BTI, Callsign: Airbaltic, IATA Prefix: 657, | LV | AVCODES |
| 2 | BT | Air Liberte | ICAO: LIB, Callsign: Air Liberte, IATA designator changed to VD | F | AVCODES |
| 3 | BT | Airlines of Northern Australia | ICAO: ANT, Callsign: Territory, | AUS | AVCODES |
| 4 | BT | Rolls Royce Ltd. (Bristol Engine Division) | ICAO: BTU, Callsign: Rolls, Designator BT recalled by IATA | GB | AVCODES |
| 5 | BT | BIRMINGTON TERMINAL CO. | | | PWRC |
| 6 | BT | Bodensee-Toggenburg-Bahn | | CH | TRAFFIC |
| 7 | BT | Bombardier Transportation Sweden AB | | SE | VKM |
| 8 | BTA | Britt Airways, Inc., d/b/a Continental Express Inc. / Air Mike Express | Callsign: Jet Link, Name changed to Expressjet Airlines, Inc. d/b/a Continental Express | USA | AVCODES |
| 9 | BTA | Expressjet Airlines, Inc. d/b/a Continental Express | Callsign: Jet Link, IATA Prefix: 565, Name changed from Britt Airways, Inc., d/b/a Continental Express Inc. / Air Mike Express | USA | AVCODES |
| 10 | BTA | Britt Airlines, Inc. | Callsign: Britt-Air, | USA | AVCODES |
| 11 | BTA | Belcanto Airlines | Callsign: Belcanto, | BY | AVCODES |
| 12 | BTA | ExpressJet | IATA: XE | | ICAO1 |
| 13 | BTAA | BOWSER TRANSPORTATION SYSTEM INC | | | SCAC3 |
| 14 | BTAA | BLESSED TO BE A BLESSING INC | | | SCAC4 |
| 15 | BTAB | B & T TRANSPORTATION INC | | | SCAC3 |
| 16 | BTAB | BROOKS TRANSPORT | | | SCAC4 |
| 17 | BTAC | BETLEY, A CARTAGE INC | | | SCAC3 |
| 18 | BTAC | B THREE (B3) COMMUNICATIONS INC | | | SCAC4 |
| 19 | BTAD | BERTINOIA, DONALD K | | | SCAC3 |
| 20 | BTAE | BATTEATE, ALBERT A TRUCKING | | | SCAC3 |
| 21 | BTAE | BUCKSHIRE CORPORATION | | | SCAC4 |
| 22 | BTAF | BAILEY TRANSFER CO | | | SCAC3 |
| 23 | BTAG | BEAR TRANSPORTATION SERVICES, INC. | | | SCAC3 |
| 24 | BTAG | BEAR TRANSPORTATION SERVICES L P | | | SCAC4 |
| 25 | BTAG | Bantåg - Railcare Group | | S | TRAFFIC |
| 26 | BTAH | BRIDGER TRANSPORTATION INC | | | SCAC3 |
| 27 | BTAI | BARRETA TRANSPORTATION INC | | | SCAC3 |
| 28 | BTAJ | BELL TRANS INC | | | SCAC3 |
| 29 | BTAK | BUTLER TRANSPORT INC | | | SCAC3 |
| 30 | BTAK | BUTLER TRANSPORT INC | | | SCAC4 |
| 31 | BTAL | BARLETTE TRANSPORT LTD | | | SCAC3 |
| 32 | BTAL | BOULMETIS, TANYA | | | SCAC4 |
| 33 | BTAM | BATES, GARY | | | SCAC4 |
| 34 | BTAN | BEST TRANSPORT | | | SCAC3 |
| 35 | BTAO | BERTRAND OIL COMPANY | | | SCAC3 |
| 36 | BTAO | BELTRAN BELTRAN, JESUS A | | | SCAC4 |
| 37 | BTAP | B TWO (2) TRANSPORTATION INC | | | SCAC4 |
| 38 | BTAQ | BREEDING TRANSFER & STORAGE INC | | | SCAC3 |
| 39 | BTAR | BETLEY ARMORED COURIER INC | | | SCAC3 |
| 40 | BTAS | BARNETT TRANSPORTATION INC | | | SCAC3 |
| 41 | BTAS | BARNETT TRANSPORTATION INC | | | SCAC4 |
| 42 | BTAT | BUSTERS TRAILER TOTERS | | | SCAC3 |
| 43 | BTAT | BURNS, TATE | | | SCAC4 |
| 44 | BTAX | Air Liquide IC GP LLC d/b/a Air Liquide Industrial U.S. LP | added 7/2008 | | NAKINA |
| 45 | BTAX | Air Liquide America Corp. | added 4/1997; 7/2000-7/2005; eliminated 7/2008 | | NAKINA |
| 46 | BTAX | Big Three Lincoln-Alaska, Inc. | added 10/1981; 1/1994; eliminated 4/1997 | | NAKINA |
| 47 | BTAX | Big Three Lincoln-Alaska, Inc. | added 10/81; 1/94; eliminated 4/97 | | NRHS |
| 48 | BTAX | Air Liquide America Corp. | added 4/97; 7/2000 | | NRHS |
| 49 | BTAX | *BIG THREE LINCOLN ALASKA, INC. | | | PWRC |
| 50 | BTAX | +AIR LIQUIDE AMERICA CORP. | | | PWRC |
| 51 | BTAX | Big Three Lincoln-Alaska (Air Liquide America Corporation) | | | RSRV |
| 52 | BTAX | BIG THREE LINCOLN ALASKA, INC. | | | SCAC4 |
| 53 | BTAZ | (BRAX) BRAE CORPORATION | | | PWRC |
| 54 | BTB | Air National Guard | Callsign: 158 Fighter Wing, | USA | AVCODES |
| 55 | BTB | Baselland Transport Birsigtalbahn | | CH | TRAFFIC |
| 56 | BTBA | B & T TRUCKING CO | | | SCAC3 |
| 57 | BTBA | B & T PALLET INC | | | SCAC4 |
| 58 | BTBB | BALL TIMBER CO | | | SCAC3 |
| 59 | BTBC | BADGER TRUCK BROKERAGE COMPANY INC | | | SCAC3 |
| 60 | BTBE | BAKER TRUCK BROKERAGE INC | | | SCAC3 |
| 61 | BTBF | BEN TOURS INC | | | SCAC3 |
| 62 | BTBF | BO TIRE SALES & REMOVAL | | | SCAC4 |
| 63 | BTBG | BOBS TRUCK BROKERAGE CO | | | SCAC3 |
| 64 | BTBI | BRITTON TRUCK BROKERAGE INC | | | SCAC3 |
| 65 | BTBI | BTL LLC | | | SCAC4 |
| 66 | BTBJ | BUSINESS TRANSPORTATION SOLUTIONS I | | | SCAC4 |
| 67 | BTBK | BEREA TRUCK BROKERS | | | SCAC3 |
| 68 | BTBM | BOATNER TRUCKING CO INC | | | SCAC3 |
| 69 | BTBO | B T B TRUCKING INC | | | SCAC3 |
| 70 | BTBO | BORDER TO BORDER LOGISTICS LLC | | | SCAC4 |
| 71 | BTBQ | BOONE TRUCKING SERVICES LLC | | | SCAC4 |
| 72 | BTBR | BETTENCOURT BROTHERS INC | | | SCAC3 |
| 73 | BTBR | BITTNER, BRAD | | | SCAC4 |
| 74 | BTBT | B T B TRUCKING EXPRESS INC | | | SCAC3 |
| 75 | BTBT | B TWO B (B2B) TRANSPORTATION SERVIC | | | SCAC4 |
| 76 | BTBU | BOX2BUILD SALES B.V. | | NL | BIC |
| 77 | BTBU | BASLER TURBO CONVERSIONS | | | SCAC4 |
| 78 | BTBV | BADGER TRANSPORTATION INC | | | SCAC3 |
| 79 | BTBW | BUMPER TO BUMPER WRECKER SERVICE | | | SCAC3 |
| 80 | BTBX | B.T. Babbitt, Inc. | 8/1920-7/1923 | | NAKINA |
| 81 | BTBX | B. T. BABBITT, INC. | | | PWRC |
| 82 | BTC | Bashkir Airlines (BAL) | Callsign: Bashirian, IATA Prefix: 940, Designator V9 recalled by IATA | RUS | AVCODES |
| 83 | BTC | Baltic Flight Academy | Name changed to BFA Airlines | LT | AVCODES |
| 84 | BTC | BFA Airlines | Name changed from Baltic Flight Academy | LT | AVCODES |
| 85 | BTC | BAL Bashkirian Airlines | IATA: V9 | | ICAO1 |
| 86 | BTC | Birmingham Terminal | 1/1994-7/2005 | | NAKINA |
| 87 | BTC | Birmingham Terminal | 1/94-7/2000 | | NRHS |
| 88 | BTC | *BOSTON TERMINAL CO. | | | PWRC |
| 89 | BTC | +BIRMINGHAM TERMINAL CO. | | | PWRC |
| 90 | BTC | Birmingham Terminal | | | RSRV |
| 91 | BTCA | BOATCAN COMPUTER BOAT SALES LIMITED | | | SCAC4 |
| 92 | BTCB | BLATT TRUCKING CO | | | SCAC3 |
| 93 | BTCD | BURR TRANSPORTATION CO INC | | | SCAC3 |
| 94 | BTCE | BULK TRANSPORT CO OF ESSEXVILLE INC | | | SCAC3 |
| 95 | BTCE | BTC EXPRESS INC | | | SCAC4 |
| 96 | BTCG | BEST TRUCKING | | | SCAC3 |
| 97 | BTCH | BAR TRAN CORPORATION | | | SCAC3 |
| 98 | BTCH | Bombardier Transportation (Switzerland) SA | | CH | VKM |
| 99 | BTCI | B T CARTAGE CO | | | SCAC3 |
| 100 | BTCJ | BUCKEYE TRANSPORT CORP | | | SCAC4 |
