Apple Inc. hasn’t said yet how well the iPad Air did over its launch weekend, but a teardown report from IHS iSuppli on Tuesday suggests the company has improved its profit margins on the full-sized tablet IHS iSuppli estimates that it costs Apple about $310 to build the 16GB version of the iPad Air with cell connectivity. This version sells for $629 in the U.S. — implying a margin of about 51% for the device. IHS estimated a $358 build cost for the third-gen iPad last year at a similar point in its lifecycle, implying a margin of about 43% for that version. http://blogs.marketwatch.com/thetell/2013/11/05/apple-beefs-up-margins-on-ipad-air-teardown-says/