The second method listed is effectively the same as the U/AIS system that ships use[0]. The "U" stands for "Universal", from which we can deduce that actually only about 60% of ships actually use it.
The technology already exists, it just needs to be mandated for aircraft.
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[ 2.8 ms ] story [ 35.3 ms ] threadThe technology already exists, it just needs to be mandated for aircraft.
[0] http://en.wikipedia.org/wiki/Automatic_Identification_System