Preheat the air fryer to 400°F (200°C) for 3–5 minutes. A hot basket is key to crisp skin.
Pat the salmon very dry on both sides with paper towels. Dry skin equals crisp skin.
Season simply: Rub a thin film of oil over the skin and flesh.
Sprinkle salt and pepper all over. If using spices, add a light dusting to the flesh side only.
Prepare the basket: Lightly oil or spray the air fryer basket to prevent sticking. You can place salmon directly on the basket or on a perforated parchment liner made for air fryers.
Place salmon skin-side down in the basket, leaving a little space between pieces so air can circulate.
Air fry for 7–10 minutes at 400°F (200°C), depending on thickness.
A standard 1-inch-thick fillet usually takes about 8 minutes.
Check doneness: The salmon should flake easily and be just opaque in the center. For precision, aim for an internal temp of 120–125°F for medium-rare or 130–135°F for medium, measured in the thickest part.
Optional extra-crisp finish: If you want even crisper skin, flip the fillets skin-side up for the final 1–2 minutes.
Rest 2 minutes, then finish: Add a squeeze of lemon, a small pat of butter, or a sprinkle of herbs. Serve right away for the best texture.