Lightly spray the basket of your air fryer with non-stick spray. Preheat per manufacturer's recommendation.
Combine the baking powder and salt and pepper Sprinkle over the wings and toss to coat.
Add the wings to the basket (be careful it's hot!). If you have trouble fitting them without overlapping, stand the drumettes along the sides of the basket.
Cook at 360 F for 12 minutes for large wings, 10 minutes for smaller ones.
Carefully flip the wings (rotate the drumettes if they are standing) and cook another 12 minutes again (10 minutes for smaller wings) at 375 F.
Flip the wings one last time. Increase the temperature to 390 F and cook another 6 minutes (4 minutes for smaller wings).
Combine the flour and salt and pepper in a large bowl.
Rinse the wings. Drain well but do not dry the wings.
Add the wings to the flour mixture and turn to coat well. Transfer to a plate and place in the fridge for 30 minutes.
Heat 3" of oil in a Dutch oven or deep fryer to 350 F.
Working in batches if necessary, fry the wings 8-10 minutes or until they reach 165 F. Transfer to a rack over a baking sheet or a paper towel-lined plate to drain.