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New planes have a feature called a pulselight, which pulses the landing light on and off. It is very easy to see from a long distance, but only if the plane is facing you. New planes also have ADS-B, which displays the location and altitude of other aircraft in the area. Now the actual idea: replace
the standard rotating beacon light on planes with a very bright landing light mounted on a swivel on the tail. Use the ADS-B to identify targets and point the pulselight at them. Traffic will suddenly become nearly impossible *not to see. It's like using a signal mirror to direct sunlight at someone's face.
||// What if there are multiple targets in the vicinity? //
||That's what AWACS is for - to separate the friendlies from the hostiles, so the Air National Guard has timely (if completely wrong) targeting information.