Meaning of (वायुयान चालन_[विज्ञान) vayuyan chalana_[vigyana in english
As noun :
aviation Ex:  General aviation traffic generally uses North Las Vegas Airport
Suggested : the design, development, production, operation, and use of aircraft, especially heavier-than-air aircraft
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(वायुयान चालन_[विज्ञान) vayuyan chalana_[vigyana
can be used as noun.. No of characters: 21 including consonants matras.
Transliteration :
vaayuyaana chaalana_[viGYaana