Place the banana slices on a baking sheet. Coat the banana slices with lemon juice and sprinkle lightly with salt. Spray the banana slices with a little oil.
Place the banana slices in a single layer in the basket of the air fryer. Place the basket into the air fryer and cook the air fryer banana chips for 40 minutes.
Air frying banana chips will get you a crispy chip, but you have to check the chips at halfway through the cooking time and loosen the bananas from the air fryer basket.