Spray air fryer basket with non stick spray and lay frozen or fresh fillets inside, do not overlap them. Cut lemon in half, lightly squeeze some of one half on to fish and then sprinkle with seasonings.
Slice other half of lemon and put a thin slice of fresh lemon on each fillet. Close basket and set to 390 degrees for 8 minutes for fresh and 10-12 minutes for frozen, check at 8 minutes because timing will depend on size and thickness of pieces.
Fish is done when it is flaky with a fork and white, not opaque.