It is really hard to say for sure as you can imagine we don’t have a whole lot of documents of this age to read!
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Kungshu Phan was an engineer around 4th C BC flew wooden dove for three days and nights. Probably this was a kite.
Chang Heng 2nd C BC is recorded flying a similar craft with moving wings.
Han Hsin 169BC used a kite to tell how far to dig a tunnel to a castle he was trying to invade.