An air fryer is excellent for reheating dry-rubbed, not wet-mopped, ribs. Preheat the air fryer to 350 degrees, slice your ribs into a portion that will fit comfortably in the fryer basket, toss them with a tablespoon of neutral-flavored, high-heat oil, and cook them for three to four minutes, or until their internal temperature comes to 130 to 140 degrees.