Scrub and dry the potato, then with a mandoline, cut into paper-thin slices (1/4 inch or thinner). For a crinkle cut, use a waffle slicer like this.
Arrange the potatoes in a large bowl. Pour the pickle juice over the top. Add 1 tablespoon dill, then stir to coat. Marinade for 1 hour, stirring a few times throughout to coat.
Drain the potatoes, spread into paper towels, and pat as dry as possible. Wipe out the bowl, then return the potatoes to it. Toss with the oil, salt, garlic powder, cayenne, and remaining 1 teaspoon dill.
Spread the potatoes in the bottom of your air fryer basket in an even layer so that you have no more than two layers of potatoes overlapping (I cooked mine in two batches). Air fry at 325°F for 20 minutes, until the potatoes are dark golden at the edges and crisp, tossing them with tongs every 5 to 7 minutes so they cook evenly. If some chips finish earlier than others, remove them to a plate as they are ready. Repeat with remaining potatoes.
Notes
Nutritional information was calculated without pickle juice.
Store leftovers airtight at room temperature. Rewarm in the air fryer at 325°F.