American International Group’s (AIG) property/casualty and life/health subsidiaries’ financial strength ratings (FSR) and issuer credit ratings (ICR) have been affirmed by AM Best Co.Best has affirmed the ICR of “bbb” of AIG. The outlook for all ratings is negative.The ratings of the Chartis US Insurance Group (Chartis), which is comprised of the commercial pool led by National Union Fire Insurance Company of Pittsburgh, Pa. (NUFIC) and two entities that are significantly reinsured by NUFIC, and the Lexington Insurance Pool, led by Lexington Insurance Company, reflect their supportive level of risk-adjusted capitalisation.