The YAL-1A, a modified Boeing 747-400F known as the Airborne Laser, will test-fire its low-power laser in flight for the first time as part of a long-term test phase at the Air Force Flight Test Center at Edwards Air Force Base, Calif., according to an Air Force report.
http://www.airforcetimes.com/news/2007/01/AFairbornelaser070129/