The U.S. Air Force is purchasing 20 aircraft, along with related training, maintenance and support products, from Brazil.&nbsp; Get details at:&nbsp; <a href="http://finance.yahoo.com/news/Brazil-Embraer-aircraft-wins-rb-4269760435.html">finance.yahoo.com/news/Brazil-Embraer-aircraft-wins-rb-4269760435.html</a><br />