Preheat an air fryer to 400 degrees F (200 degrees C).
Place green beans in a bowl. Whisk together sesame oil, soy sauce, rice wine vinegar, garlic, and red pepper flakes in a separate bowl and pour over green beans. Toss to coat and let marinate for 5 minutes.
Place half the green beans in the air fryer basket. Cook 12 minutes, shaking basket halfway through cooking time. Repeat with remaining green beans.
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