Bell Helicopter and Boeing Co. were awarded an additional $4.9 billion contract for work on 99 V-22 Osprey tiltrotor aircraft that follows a $1.4 billion preliminary contract from last year. The order, with a combined value of $6.3 billion, will send 92 MV-22 aircraft to the Marine Corps and 7 CV-22 aircraft to the U.S. Air Force Special Operations Command. Boeing and Bell Helicopter jointly build the V-22 aircraft, or Osprey, a craft that uses tiltrotor technology to combine the speed and range of a fixed-wing airplane with the vertical performance of a helicopter hat can fly as a plane. The aircraft are assembled in Amarillo with many of the parts manufactured in the Fort Worth area.