What is the meaning of Pilot balloon?

A small, unmanned balloon sent up to indicate the direction of air currents.
Webster's Revised Unabridged Dictionary
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APAWebster's. (2011). pilot balloon. Retrieved September 23, 2026, from http://smartdefine.org/pilot_balloon/definitions/2045582
ChicagoWebster's. 2011. "pilot balloon" http://smartdefine.org/pilot_balloon/definitions/2045582 (accessed September 23, 2026).
HarvardWebster's 2011, pilot balloon, Smart Define, viewed 23 September, 2026, <http://smartdefine.org/pilot_balloon/definitions/2045582>.
MLAWebster's. "pilot balloon" 27 May 2011. Web. 23 September 2026. <http://smartdefine.org/pilot_balloon/definitions/2045582>
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