| Abbreviation | Definition |
|---|---|
| B-1DIV | Rockwell B-1 Division |
| BA | Bank Angle |
| BA | Breathing Air |
| BAC | Boeing Aircraft Company |
| BAC | Booster Assembly Contractor |
| BAC | Buffer Access Card |
| BACS | Body Axis Coordinate System |
| BAI | Barometric Altitude Indicator |
| BAIR | Breathing AIR |
| BAL | BALance |
| BAN | Budget Allocation Notice |
| BARB | Ballast Aerating Retrieval Boom |
| BARM | Block Acceptance Reporting Mechanism |
| BARO | BAROmeter |
| BARS | Baseline Accounting and Reporting System |
| BAS | Block Acquisition Sequence |
| BASD | Ball Aerospace Systems Division |
| BASIS | Business And Support Information Services |
| BASS | Backup Avionics System Software |
| BATSE | Burst And Transient Source Experiment |