An airport noise monitoring system is disclosed comprising a pair of sound detectors (200, 300) installed in and spaced along a runway. A CPU monitors the output of each sound detector so as to recognize an output form from one (200) of the detectors characteristic of an aircraft flying overhead. A flag is assigned to any event giving rise to such an output form indicating the direction of motion of the aircraft, depending on the sound profile from the detector (300) other than the one providing the characteristic output form, and also indicating whether the aircraft is landing, taking off or flying by. Accurate timing and direction information may be obtained and accurately correlated with noise events detected around the airport, to identify noisy flights or carriers.
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