higher take-off weights, luxury appointments and offering an all-glass flight deck. Beechcraft developed the T-1 Jayhawk version for the United States Air Force, used as a trainer for crew of large aircraft like tankers and strategic transports: 180 were delivered between 1992 and 1997. The Japan Air Self-Defense Force 400T trainer shares the T1-A Type certificate. In 1993, Raytheon purchased the Hawker business jets from British Aerospace and renamed the Beechjet 400 as the Hawker 400 to include it in the line. In 2003, Raytheon began to produce Hawker 400XP, which included: gross weight increase, a nine passenger seating option, thrust reversers, TCAS II, and an emergency locator beacon. In 2008, Hawker Beechcraft announced an improved Hawker 450XP including new, more fuel efficient Pratt & Whitney PW535Ds with 2,965 pounds of thrust each, but it was canceled in June 2009 due to poor economic conditions. In 2009, its unit cost was $7.4 million USD. Nextant Aerospace re-manufactured Hawker 400XP as the Nextant 400XT, replacing the JT15Ds with Williams FJ44-3APs and adding new avionics and interior. It was FAA-certified in October 2011. Up to one-third of the 400A/400XP fleet could be retrofitted, enabling improved range, speed and fuel efficiency. It should keep their resale value to remain in economic service for another twenty to thirty years, like Falcon 20s reengined with TFE731s. In 2012, Textron has first flown Hawker 400XPR, which improves 4-pax range to , has better hot and high performance, and can climb to FL450 at max takeoff weight in 19 min. The conversion features new avionics, interior, winglets, and Williams FJ44-4A-32 engines. Hawker 400XPR was certified in 2016, and first fully configured Hawker 400XPR was delivered in July 2017; the upgrade can be performed in 12 weeks with a choice of Rockwell Collins Pro Line 4 to 21 or Garmin G5000 avionics. Operational history The type is used by many corporate and private users, it is also used by air-taxi and air charter companies. In 2014, most were U.S. registered, a majority with single aircraft operators. Flight Options and Travel management co. were its largest operators as NetJets Europe has disposed of its fleet. The second highest concentration was in Mexico, then Brazil, the rest were scattered throughout the world. The USAF operated 178 T-1A Jayhawks. Charter and fractional operators fly at least 800 to 900 hours per year while most corporate operators fly 300 to 400 hours.