Insurance company American International Group Inc. will receive additional financial aid from the government, bringing the total rescue package for the firm to about $150 billion.  The US plans to buy $40 billion of preferred shares and reduce the original loan that was given to bail-out AIG from $85 billion to $60 billion. The Federal Reserve said today that the government will also purchase $52.5 billion of mortgage securities owned or backed by the company.   The news of the aid comes after AIG recorded a fourth straight quarterly loss.