I don't know which one you consider to be the third one, or what this question has to do with math. Two of the planes were crashed into the World Trade Center. One plane was crashed into the Pentagon although, based on its flight path, its original target is believed to have been the White House but they apparently couldn't find it. The other plane was presumeably intended for the Capitol but the passengers attacked the hijackers, attempting to retake the plane. It crashed in rural Pennsylvania.
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911 HELP !
It is: 911 = CMXI
The coordinates of (-6, -2) are in the 3rd quadrant on the Cartesian plane
1 x 911, 911 x 1
911 = CMXI in Roman numerals