Apple may have had very aggressive launch shipments of the iPad 2 despite the shortages, part suppliers said Wednesday. About 2.4 million to 2.6 million of the tablets are believed to have shipped just in March. The rate should accelerate faster still, Digitimes said, and would hit four million to 4.3 million per month in each spring month to lead to at least 12 million iPad 2s in the season.