I did some searches and couldn't find any posts on this yet, so apologies if this is a repost. The USAF, DARPA and other agencies successfully flew the X-51A, a hypersonic scramjet powered aircraft that flew under power for over 200 seconds. The previous scramjet record for powered flight was 12 seconds. There are three more flights planned in the fall. The aircraft is initially powered by a rocket that gets it up to speed so that the scramjet can ignite. Pretty cool flight technology.
http://www.afmc.af.mil/news/story.asp?id=123206524
http://www.afmc.af.mil/news/story.asp?id=123206524