The last radio contact with Flight 77 is made when a pilot asks for clearance to fly higher. However, six minutes later, the plane fails to respond to a routine instruction. Presumably, it is hijacked during that time. Indianapolis flight control center is handling the plane by this time. [New York Times, 10/16/2001; Guardian, 10/17/2001; Boston Globe, 11/23/2001; 9/11 Commission, 7/24/2004, pp. 8]