Example: Imagine that you want to write a descriptive essay about your grandfather. You've chosen to write about your grandfather's physical appearance and the way that he interacts with people. However, rather than providing a general description of these aspects, you want to convey your admiration for his strength and kindness. This is your reason for writing the descriptive essay. To achieve this, you might focus one of your paragraphs on describing the roughness of his hands, roughness resulting from the labor of his work throughout his life, but you might also describe how he would hold your hands so gently with his rough hands when having a conversation with you or when taking a walk.
If air traffic controllers believed Flight 11 had been hijacked at 8:13, NORAD should have been informed immediately, so military planes could be scrambled to investigate. However, NORAD and the FAA both claimed NORAD was not informed until 8:40—27 minutes later. [ NORAD, 9/18/01 , AP, 8/12/02 , AP, 8/19/02 , Newsday, 9/10/02 ; one NORAD employee said it took place at 8:31, ABC News, 9/11/02 ] Indeed, before contacting NORAD, Boston air traffic controllers watched Flight 11 make an unexpected 100-degree turn and head south toward New York City [ Christian Science Monitor, 9/13/01 ], told other controllers of the hijacking at 8:25 [ Guardian, 10/17/01 ], continued to hear highly suspicious dialogue from the cockpit (such as, “Nobody move, please, we are going back to the airport. Don’t try to make any stupid moves” ) [ Guardian, 10/17/01 , New York Times, 10/16/01 ], and even asked the pilots of Flight 175 to scan the skies for the errant plane. [ Guardian, 10/17/01 , Boston Globe, 11/23/01 ]