Usage of Apple’s third-generation iPad in the United States has passed the original iPad model after just over two months of availability. According to a recent report from software analytics firm Localytics, Apple’s latest iPad captured a staggering 14% of the U.S. iPad market in just four days when Apple sold more than 3 million devices during the tablet’s debut. Now, a week and two months after the third iPad launched on March 16th of this year, the new model’s share of U.S. usage topped 20% during the week of May 16th, narrowly surpassing the original model for the first time. Apple’s first iPad tablet launched in the U.S. on April 3rd, 2010 — more than two years ago — and was available for purchase at a discounted price until the third-generation iPad launched in March of this year. According to Localytics, Apple’s iPad 2 currently accounts for 60% of all iPad usage in the U.S.