It is possible that you might equate the number of people that the air fryer can serve with its footprint. This is because the capacity of the frying basket determines how much food you can cook. If you are cooking for one or two people, two quarts will be sufficient. You will have enough capacity to cook for an audience of 4 to 6 members if you choose 3.5-quart to 5-quart models. Diners who use the upper end of the capacity range (above 5 quarts) are more likely to use it.