Second Testbed G600 Joins Test Campaign General Dynamics company Gulfstream has flown the second G600 testbed aircraft. It has now completed the first flight which lasted 4 hours and 26 minutes and signaled the official joining to the flight-test campaign. The first test G600 took to the skies only in mid-December 2016. Once everything keeps on track and goes to plan we expect to see certification from the Federal Aviation Administration (FAA) of the long-range G600 in 2018. Deliveries and entry into service of this aircraft are also expected the same year.