Video, WOW Let that sink in - Wing span equal to the width of a good size building lot. It's relatively light (at 5 ton), slow, flies at twice the altitude of commercial transport. It's powered by 2 truck engines and stays aloft for 4 days. Now take a look: http://video.boeing.com/services/player/bcpid1173939806001?bckey=AQ~~%2cAAAAukPAlqE~%2coAVq1qtdRjwBrIkHYj2MSytJiEK9s5fy&bctid=1331877361001