 The company has a Gulfstream G550 test aircraft that has been integrated with Joint STARS capabilities and has flown for more than 500 hours.The test aircraft's existence was announced in 2014.Lockheed Martin has teamed with Raytheon and L-3 Communications to offer a JSTARS replacement, but will not decide which platform to use until the Air Force decides if it wants a converted airliner or business jet-sized class aircraft.