| 1 | BUG | Mokulele Flight Service, Inc. | IATA: MW, Callsign: Speedbuggy, IATA Prefix: 415, ICAO designator changed to MUL. ICAO callsign changed to Mokulele. IATA designator changed from 5Z* | USA | AVCODES |
| 2 | BUG | Innovation First Transportation, Inc. | Callsign: Hexbug, | USA | AVCODES |
| 3 | BUG | Mokulele Airlines | | | ICAO1 |
| 4 | BUG | BUG Verkehrsbau AG | Berlin (BUG = Bau u. Unterhaltung von Gleisanlagen) | D | privat-bahn.de |
| 5 | BUG | BUG Verkehrsbau AG | This new track maintenance company originates from the company Bau und Unterhaltung von Gleisanlagen (BUG), founded in 1990. It is based in Berlin. As BUG is not yet registered as an operator, the stock is actually in service for OHE-Sp. | D | TRAFFIC |
| 6 | BUG | BUG Vermietungsgesellschaft mbH | | DE | VKM |
| 7 | BUGA | BAUER, G A TRUCKING | | | SCAC3 |
| 8 | BUGAU | Bugatti Automobili S.p.A. | 1987–1995 | I | TRAFFIC |
| 9 | BUGC | BURNS BEVERAGE CO | | | SCAC3 |
| 10 | BUGD | BUTCHART GARDENS LTD, THE | | | SCAC4 |
| 11 | BUGE | BURGESS TRANSPORTATION | | | SCAC3 |
| 12 | BUGE | BURGESS TRANSPORTATION | | | SCAC4 |
| 13 | BUGEB | Automobiles Ettore Bugatti | | F | TRAFFIC |
| 14 | BUGG | N R BUGGE | | | SCAC3 |
| 15 | BUGG | BROADCAST UNIFYING GEARS (BUG TV) I | | | SCAC4 |
| 16 | BUGH | BURGHART | | | SCAC3 |
| 17 | BUGK | BLUEGRASS TRUCKING | | | SCAC3 |
| 18 | BUGL | BURGUNDY LIMOUSINE INC | | | SCAC3 |
| 19 | BUGL | BUG LOGISTICS | | | SCAC4 |
| 20 | BUGM | BRUGGER & MCDOWELL INC | | | SCAC3 |
| 21 | BUGN | BUGARIN, M TRUCKING INC | | | SCAC4 |
| 22 | BUGO | BUSH, GEO S & CO INC AN OREGON CORP | | | SCAC3 |
| 23 | BUGO | BUSH, GEO S & CO INC AN OREGON CORP | | | SCAC4 |
| 24 | BUGP | BUDGET TRANSPORT INC | | | SCAC3 |
| 25 | BUGR | BUDGET RENT A CAR OF WILMINGTON NC | | | SCAC3 |
| 26 | BUGS | BUGLE SHIPPING COMPANY LIMITED | | | SCAC4 |
| 27 | BUGT | BUGS TRUCKING INC | | | SCAC4 |
| 28 | BUGU | BUGSIER REEDERI UNG BERGUNGS GESELL | | | SCAC3 |
| 29 | BUGVW | Bugatti Automobiles S.A.S. | 1998 - | I | TRAFFIC |
| 30 | BUGX | Bruggere & Monson | 7/2000 (not listed) | | NAKINA |
| 31 | BUGX | Bruggere & Monson | Jul-00 | | NRHS |
| 32 | BUGX | *BRUGGERE & MONSON | | | PWRC |
| 33 | BUGX | +DIESELMOTIVE COMPANY, INC. | | | PWRC |
| 34 | BUGX | Bruggere and Monson | | | RSRV |
| 35 | BUGX | DIESELMOTIVE COMPANY INC | | | SCAC4 |
