Preheat a 6-quart air fryer to 400°F for 3 minutes. Pat chicken dry; toss with salt, garlic powder, pepper, and cornstarch. Shake off loose starch.
Gently toss with oil; space half in one layer. Air fry 5 minutes; turn and cook 5 to 7 minutes more until lightly crisp and at least 165°F.
Transfer to a clean bowl; repeat remaining chicken. Meanwhile, warm hot sauce, butter, and vinegar in a small saucepan until butter melts.
Toss both cooked batches with warm Buffalo sauce just until coated.
Rest 2 minutes; serve immediately while edges retain texture.