Marinate: Whisk the buttermilk, pickle juice, hot sauce, salt and spices. Add the chicken, cover and refrigerate 30 minutes to overnight.
Make the coating: Whisk the coating ingredients in a shallow dish. Rub in 2 tablespoons of marinade to form small clumps.
Dredge: Preheat the air fryer to 400°F. Dredge each thigh firmly on both sides and rest 5 minutes.
Air fry: Spray the basket, add the chicken in a single layer and spray the tops. Air fry 9 minutes, flip, spray and cook 7 to 9 minutes more, until golden and 165°F inside.
Make the hot honey: Meanwhile, warm the honey, hot sauce and butter over medium-low heat for 2 to 3 minutes, stirring until smooth.
Toast the buns: Toast the buns cut-side up at 400°F for 1 to 2 minutes.
Build: Brush the chicken with hot honey. Spread ranch on the bottom buns and layer pickles, chicken, more hot honey and lettuce. Add the top buns and serve.