1. Mix 1 tablespoon pickle juice, 1 tablespoon hot sauce, and 1/2 teaspoon salt in a bowl or shallow dish. Add chicken and coat. Cover and refrigerate for 1 hour. Discard marinade from chicken.
2. Start the air fryer at 375°. Mix flour, another 1/2 teaspoon salt, and pepper in a shallow bowl. Whisk egg, buttermilk, and remaining 1 tablespoon pickle juice and 1 tablespoon spicy sauce in another shallow basin.
3. Dust chicken on both sides with flour and shake off excess. Egg mixture, then flour mixture.
4. Spray cooking spray on a well-greased air-fryer basket tray and place chicken in a single layer in batches. Cook for 5-6 minutes till golden. Turn and spray. Continue cooking for 5-6 minutes until golden brown.