Prep the salmon. Pat the fillets dry with paper towels.
Rub with olive oil, then season both sides with salt, pepper, and garlic powder. Let them rest at room temperature for 10 minutes while you make the glaze.
Make the glaze. In a small saucepan, combine orange zest, orange juice, soy sauce, honey, rice vinegar, and ginger. Bring to a gentle simmer over medium heat, stirring occasionally for 3–4 minutes.
Thicken it. Stir in the cornstarch slurry and simmer 30–60 seconds until glossy and slightly thickened.
Remove from heat. The glaze should coat the back of a spoon.
Preheat the air fryer. Set to 390°F (200°C) for 3 minutes. Lightly mist the basket with oil or line with a perforated parchment designed for air fryers.
First cook. Place salmon in the basket, skin-side down if using skin-on.
Air fry for 5 minutes.
Glaze and finish. Brush a generous layer of orange glaze over the tops. Air fry 2–4 more minutes, until the salmon flakes easily and reaches an internal temperature of 125–130°F for medium or 135°F+ for well-done. Brush with a little extra glaze right after cooking.
Garnish and serve. Sprinkle with sesame seeds and scallions if you like.
Serve with extra glaze and orange wedges.