An automatic fire suppression system used to provide protection of window glass and other structural elements in aircraft terminals which are exposed to exterior fires caused by natural, accidental, or intentional events comprises a directional passive microwave receiver, a central processor for processing received microwave signals over time and comparing the received signals over time with thermal event signatures stored in memory to selectively actuate a sprinkler system for protecting the window glass in the vicinity of an identified fire event. The memory may further store a model of the aircraft terminal, and the processor utilizes a fire dynamics simulator to simulate a thermal event at the terminal. A related fire suppression process involves the detection of incipient fires through an array of exterior passive microwave heat sensor fire detectors connected to an electronic control processor which identify zones such as 30 to 100 linear foot zones of exterior glass surface and automatically initiates an array of quenching sprinkler heads applying water to the exposed surfaces of glass and other structural elements in response to detection of an identified fire event by its signature.