Preheat an air fryer with a capacity of 3.5 quarts to 400 degrees F. Season both sides of the steak with a liberal sprinkle of salt and several grinds of black pepper before grilling or broiling. In an air fryer basket, place the steak in the center and cook till medium-rare, 12 minutes for medium, and 14 minutes for medium-well, depending on the thickness of the steak you like.