In small bowl, combine red wine vinegar, 1 tablespoon olive oil, capers, chopped scallion, and 1/4 teaspoon pepper; set aside.
STEP 2
Heat air fryer to 400°F. In bowl, toss tomatoes and remaining tablespoon oil with 1/4 teaspoon each salt and pepper. Season salmon with 1/4 teaspoon each salt and pepper.
STEP 3
Place salmon in single layer on 1 side of air fryer and add tomatoes to remaining space (piling them is great). Air-fry until salmon is just barely opaque throughout, 6 minutes.
STEP 4
Transfer tomatoes to bowl with vinegar-scallion mix and toss to combine, then toss with parsley.
STEP 5
Spread labneh or yogurt on flatbreads, top with salmon and arugula, then spoon tomato mixture on top. Sprinkle with sliced scallions and crumbled feta if desired.