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Most airliners have TCAS: https://en.wikipedia.org/wiki/Traffic_collision_avoidance_system https://en.wikipedia.org/wiki/Traffic_collision_avoidance_sy...

• dharmab 5y ago
  Yes, TCAS allows cooperating aircraft to tell each other their position. But it's not required for small aircraft and both aircraft need it for functionality.
  • na85 5y ago
    No, both aircraft don't need it. As long as the traffic has a transponder, TCAS can see it.