| Aviator |
| A person practising flight by a medium heavier than air. |
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| Back |
| A change of wind in a counter-clockwise direction (i.e. from E to N) |
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| Backs |
| The wind "backs" when its directions is anti-clockwise. |
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| Backwash |
| The disturbed air in the wake of an aeroplane in flight |
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| Ballast |
| Sand or water for weighting down a balloon. |
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| Ballonet |
| An air chamber inside of any balloon, having connection with the outside air. |
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| Balloon |
| Any type of air vessel "lighter than air" may be made of silk, cotton, rubberized fabric, etc. |
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| Balloon bed |
| A mooring place on the ground for a captive balloon. |
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| Balloon cloth |
| The cloth, usually cotton, of which balloon fabrics are generally made. |
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| Balloon, To |
| The upward glide of an aeroplane near the ground caused by the pilot descending too fast and pulling the control lever back too much or too quickly |
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