Sprinkle chicken with salt and pepper. Heat oil in heavy large skillet over medium-high heat. Add chicken, skin side down, to skillet and cook until golden, about 7 minutes per side. Transfer chicken to plate. Add onions and garlic to drippings in skillet; saute until onions are slightly softened, 7 to 8 minutes. Add wine and saffron to skillet; bring to boil. Continue to boil until liquid is thickened and reduced by less than half, about 8 minutes. Add 2 cups chicken broth to skillet. Return chicken to skillet; bring to boil. Reduce heat to low. Cover; simmer gently until chicken is very tender (adjust heat to prevent boiling and turn chicken over after 30 minutes), about 1 hour total. Transfer chicken to plate and cool. Reserve skillet with juices. Remove skin and bones from chicken and discard. Tear chicken meat into bite-size pieces; place in medium bowl and reserve. Cook pasta in pot of boiling salted water until just tender but still firm to bite, stirring occasionally. Drain; return to pot. Meanwhile, spoon off fat from juices in skillet; discard fat. Add cream to juices in skillet and boil until sauce is reduced to 2 1/2 cups and is thick enough to coat spoon, about 10 minutes. Stir in 2 tablespoons lemon juice, then chicken pieces. Stir over medium heat until heated through, adding more broth by 1/4 cupfuls to thin sauce as needed and adding more lemon juice by teaspoonfuls, if desired, about 5 minutes. Season with salt and pepper. Add chicken mixture to pasta in pot and toss to coat. Stir in basil. Transfer pasta to plates. Serve a floral, fruity white, like the Montinore Estate 2008 “Almost Dry” Riesling (Oregon, $12).