Refrigerate 1/4 cup lemonade concentrate for basting. Pour remaining concentrate into a large resealable plastic bag; add chicken. Seal bag and turn to coat; refrigerate for 4 hours, turning occasionally.
Drain and discard marinade from chicken. In a large resealable plastic bag, combine the flour, salt and pepper. Add chicken, a few pieces at a time, and shake to coat.
In a large skillet, brown chicken in oil for 1-1/2 to 2 minutes on each side or until golden brown.
Place chicken on a rack in a shallow roasting pan. Brush with butter. Bake, uncovered, at 350° for 50-55 minutes or until juices run clear, basting with reserved lemonade concentrate every 15 minutes. Serve warm or cold. Yield: 4-6 servings.