Preheat air fryer to 325°. In a bowl, combine the graham cracker crumbs, butter and sugar. Pat into the bottom and 1 in. up the sides of an 8-in. springform pan that fits into the air fryer. Chill while preparing filling. , For filling, beat cream cheese and eggs in a bowl on medium speed for 1 minute. Add 1/3 cup sugar, 1 teaspoon vanilla and salt. Continue beating until well blended, about 1 minute. Pour into crust. , Cook until center is almost set, 25-30 minutes. Cool for 10 minutes. For topping, combine the sour cream and remaining sugar and vanilla in a small bowl; spread over cheesecake. Cook 15 minutes longer. Cool on a wire rack 10 minutes. Loosen sides from pan with a knife. Cool 1 hour longer. Refrigerate 3 hours or overnight. If desired, serve with whipped cream.