Whisk flour, baking powder, sugar, and salt in large bowl.
Add cold cubed butter to flour mixture.
Cut butter into flour with pastry cutter until mixture looks like coarse crumbs with pea-sized pieces.
Pour in cold buttermilk. Stir gently just until dough comes together. Do not overmix.
Turn dough onto lightly floured surface. Pat into rectangle about 1 inch thick.
Fold dough in half. Pat to 1 inch thick. Repeat fold once more.
Pat dough to final thickness of ¾ to 1 inch.
Cut biscuits with 2½-inch cutter. Press straight down without twisting.
Gather scraps and pat together. Cut more biscuits. Makes 8 total.
Place parchment paper in air fryer basket.
Arrange biscuits on parchment with space between.
Preheat air fryer to 330°F if needed.
Air fry at 330°F for 8 to 10 minutes until golden brown.
Make honey butter. Mix melted butter, honey, and salt.
Remove biscuits immediately when done.
Brush tops with honey butter generously.
Cool 2 to 3 minutes.
Serve warm with extra honey butter.