In its most ambitious aircraft flight-test program ever, Gulfstream Aerospace has logged more than 400 hours of flight-testing in just six months as it continues to develop its newest business jet, the large-cabin, long-range Gulfstream G450. Gulfstream began the G450 development program under a blanket of secrecy in 2001 while it was still developing the recently certified large-cabin, ultra-long-range Gulfstream G550 business jet. The G450 prototype aircraft completed its first test flight April 30, 2003. Since then, the G450 flight-test program has added three more test aircraft, allowing Gulfstream to evaluate multiple aspects of the aircraft simultaneously. Effective Friday, Oct. 31, 2003, the four G450 test aircraft have completed 117 flights, testing aerodynamic performance