In large bowl, toss chicken with oil, then oregano, sumac and ½ tsp each salt and pepper. Add tomatoes and onion and toss to combine.
Arrange in even layer in air fryer basket and air-fry at 400°F, shaking basket occasionally, until chicken is golden brown and cooked through, 15 to 20 minutes.
Meanwhile, toss couscous with lemon zest and prepare per package directions. Fluff with fork and fold in lemon juice and 2 tablespoons dill.
Serve chicken and vegetables over couscous, spooning any juices collected at bottom of air fryer over top. Sprinkle with remaining dill and feta and serve with lemon wedges if desired.
