Shares of insurance company American International Group (AIG) were down Monday, in part on the heavy walloping it took from Hurricane Sandy, and a lower-than-expected price tag for its aircraft leasing unit. Shares were down 1.3% to 33.68 around midday Monday. The insurer said late Friday it expects to pay out about $2 billion in claims related to the late October storm that devastated parts of New York and New Jersey. After the reinsurance that