Preheat air fryer at 390 degrees.
Add cinnamon and salt in a bowl. Mix to blend. Set aside.
Wash the apples thoroughly in warm water. Pat dry.
Cut each apple into quarters.
Add cut apples to the bowl with the cinnamon and salt mixture.Toss the apples in the mixture.
Arrange a single layer of the apple slices in the air fryer.
Cook at 390 degrees for 8 minutes.
Flip the apple quarters at the 4-minute mark.
This batch should be ready in 8 minutes.
Check for crispness of the apple slices.
Repeat the above step for other batches.
Transfer each batch of apple chips to a cooling rack.
Allow the chips to cool completely on the cooling rack.
Serve them or put the remaining chips in an airtight container.