Preheat air fryer to 350℉ for three minutes.
Add frozen French fries to the fryer basket. Cook for 8 minutes. Remove the fryer basket and shake a few times to toss the French fries. Cook for an additional 4 minutes. Check them for doneness. They should be brown and crisp. If needed, cook an additional three minutes.
Remove French fries from basket. Toss with a little salt, if desired. Serve warm.