Pat the wings dry, then add them to a bowl and sprinkle on the salt and baking powder. Toss to evenly coat. Spread them on a wire rack, and place them in the fridge, uncovered, for at least 12 hours.
Put the cornstarch, flour, sugar, lemon pepper, and salt in a bowl and stir to combine. One by one, add a wing and toss to coat in the flour, then shake it so that there is only a very thin dusting on the wing. Repeat with all the wings.
Preheat air fryer to 400 and add the wings so that the bulk of the skin is facing up.
Fry the wings for 6 minutes, then flip, 6 more minutes, and finally one more flip and 6 more minutes.
While the wings are frying, make the sauce by mixing all the sauce ingredients in a measuring cup or small bowl. Microwave it for 30 seconds to melt the butter and mix really well to combine.
Melt the butter in a frying pan, and add in the cornbread. Smash it up to form the breadcrumbs, and toss in the butter until crispy. Stir in the pepper, lemon pepper, and scallions and cook another 2 minutes, tossing often. Remove from heat
When the wings are ready, add in the sauce to the air fryer and toss to coat. Cook them another 2 minutes, toss again, and 2 more minutes.
Serve the wings on a platter and drizzle the excess sauce on top. Sprinkle on the cornbread and eat.