| Anchor rope |
| The rope which attaches the anchor of spherical balloons. |
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| Anemometer |
| An instrument for measuring the velocity of the wind. |
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| Anemoscope |
| An instrument to determine from the basket whether a balloon is ascending of descending relative to the surrounding air. |
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| Aneroid barometer |
| An instrument for measuring atmospheric pressure and determining altitude. |
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| Angle of Incidence |
| The angle that the chord of a wing makes with the direction of motion relative to the air. A particularly muddling term, as it is often measured as the distance in inches that the front spar is above the rear spar when the aeroplane is in the flying-level position |
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| Appendix |
| The sleeve on a balloon through which it is inflated; it also provides for the escape of gas from a spherical balloon as the gas expands. |
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| Archie |
| Anti-aircraft fire |
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| Armored hose |
| Metal hose connection between the cylinder and the manifold. |
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| Aspect Ratio |
| The proportion of span to chord of a plane |
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| Aviation |
| The science of air navigation by a medium heavier than air. |
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