U.S. defense contractors are beginning modifications on a small fleet of Boeing 737 executive aircraft purchased by the Indian government to transport the South Asian nation's prime minister and president, installing technologies to defend against ground-launched, heat-seeking missiles. The government-to-government sale of the aircraft self-protection systems to equip India's three new Boeing business jets is being facilitated by the Pentagon's Defense Security Cooperation Agency and executed by the Air Force's Aeronautical Systems Center at Wright-Patterson Air Force Base, OH. Northrop...