| 1 | QB | Air Alma, Inc. | ICAO: AAJ, Callsign: Air Alma, Ceased operations on 10 january 2002. | CDN | AVCODES |
| 2 | QB | Quebecair, Inc. | | CDN | AVCODES |
| 3 | QB | Air Bisec | Name changed to Georgian National Airlines | GE | AVCODES |
| 4 | QB | Georgian National Airlines | ICAO: GFG, Callsign: Gremi, IATA Prefix: 399, Designator QB reinstated by IATA. Name changed from Air Bisec | GE | AVCODES |
| 5 | QB | Sky Georgia | ICAO: GFG, Callsign: Gremi, IATA Prefix: 399, Name changed from Georgian National Airlines. Designator QB reinstated by IATA. Name changed from Air Bisec | GE | AVCODES |
| 6 | QB | Qeshm Air | ICAO: QSM, Callsign: Qeshm Air, IATA Prefix: 237, ICAO Designator changed from IRQ. | IR | AVCODES |
| 7 | QBA | Queen Bilqis Airways | IATA: QA, Callsign: Bilqis, | YAR | AVCODES |
| 8 | QBAX | QUALITY BAKERS OF AMERICA COOPERATI | | | SCAC3 |
| 9 | QBC | Quebec Aviation Ltd. | Callsign: Inter, ICAO callsign changed to Quebec Aviation | CDN | AVCODES |
| 10 | QBC | Quebec Aviation Ltd. | Callsign: Quebec Aviation, ICAO callsign changed from Inter | CDN | AVCODES |
| 11 | QBCR | QB CORPORATION | | | SCAC3 |
| 12 | QBCU | CUBICFARM MANUFACTURING CORP | | CDN | BIC |
| 13 | QBD | Qingdao Air Express General Aviation Co., Ltd. | Callsign: Seagull Air, | PRC | AVCODES |
| 14 | QBEC | QUEBEC SHIPPING CORP | | | SCAC3 |
| 15 | QBLU | QBEX LOGISTICS BV | | NL | BIC |
| 16 | QBMO | QUEEN BEE MOVERS | | | SCAC3 |
| 17 | QBSA | QUALITY BATTERY SYSTEMS | | | SCAC4 |
| 18 | QBSC | QUEENSBRIDGE SHIPPING CORP MONROVIA | | | SCAC3 |
| 19 | QBT | Quincy Bay Terminal Co. | added 10/1992; 1/1994-7/2000; eliminated 10/2001; 7/2005 | | NAKINA |
| 20 | QBT | Quincy Bay Terminal Co. | added 10/92; 1/94-7/2000 | | NRHS |
| 21 | QBT | QUINCY BAY TERMINAL COMPANY | | | PWRC |
| 22 | QBT | Quincy Bay Terminal | | | RSRV |
| 23 | QBTI | QUISENBERRY TRUCKING INC | | | SCAC3 |
| 24 | QBTI | QB TRANSPORT INC | | | SCAC4 |
| 25 | QBUS | Q-Bus Nahverkehrsgesellschaft mbH | City: Ballenstedt | D | TRAFFIC |
| 26 | QBUZ | Qbuzz | | NL | TRAFFIC |
| 27 | QBUZZ | Qbuzz | | NL | TRAFFIC |
| 28 | QBXI | QUEBEC EXPRESS INC | | | SCAC3 |
| 29 | QBXU | CHS CONTAINER HANDEL GMBH | | D | BIC |
| 30 | QBXU | CHS CONTAINER HANDEL GMBH | | | SCAC4 |
| 31 | QBZ | Qbuzz | | NL | TRAFFIC |
