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If you mean the light gun signals from the control tower- to vehicles, and aircraft on the ground, get off the runway. For aircraft in flight, runway is unsafe, do not land.
If the aircraft is in flight, a steady green light signal from the control tower means cleared to land. If the aircraft is on the ground, it means cleared for takeoff. If the light is aimed at ground vehicles or foot traffic, steady green means cleared to cross the runway, or proceed.
American Airlines Flight 11- north tower United Airlines Flight 175- south tower American Airlines Flight 77- Pentagon United Airlines Flight 93- crashed in Pennsylvania after the passengers fought to regain control of the plane
four main areas are terminal building airport information systems flight planning and control and control tower
When the Control Tower activates the red lights, vehiclesmust stop at marked locations until the light returns to green
4 - Flight 11 hit the North Tower (Tower 1), Flight 175 the South Tower (Tower 2), Flight 77 collided with the Pentagon and Flight 93 crashed in Pennsylvania. http://www.kerman94.com/911-Flights.HTM
The north tower was hit by American Airlines Flight 11 and the south tower was hit by United Airlines Flight 175. The two other planes that were hijacked and crashed that day were American Airlines Flight 77 (crashed into the Pentagon) and United Airlines Flight 93 (crashed into a field in Pennsylvania after the passengers fought to regain control of the plane).
Four planes- American Airlines Flight 11 (crashed into the north tower), United Airlines Flight 175 (south tower), American Airlines Flight 77 (Pentagon) and United Airlines Flight 93 (crashed in a field in Pennsylvania after passengers fought the hijackers and attempted to take back control of the plane).
If your aircraft is on the ground, a steady red light from the control tower light gun means STOP. If you are airborne, a steady red light means to give way to other aircraft, and continue circling.
flight 11
American Airlines Flight 11 hit the north tower and United Airlines Flight 175 hit the south tower.
American Airlines Flight 11 flew into the north tower and United Airlines Flight 175 flew into the south tower.