It doesn't even have to be cameras https://en.wikipedia.org/wiki/Traffic_collision_avoidance_system https://en.wikipedia.org/wiki/Traffic_collision_avoidance_sy

It doesn't even have to be cameras https://en.wikipedia.org/wiki/Traffic_collision_avoidance_system https://en.wikipedia.org/wiki/Traffic_collision_avoidance_sy... >It monitors the airspace around an aircraft for other aircraft equipped with a corresponding active transponder, independent of air traffic control, and warns pilots of the presence of other transponder-equipped aircraft which may present a threat of mid-air collision (MAC). > The next step beyond identifying potential collisions is automatically negotiating a mutual avoidance manoeuver between the two (or more) conflicting aircraft. This works along side the ADS-B broadcasts for generally knowing where other planes are without ground based radar - however that's not going to be fully implemented until 2020 in the US https://en.wikipedia.org/wiki/Automatic_dependent_surveillance_%E2%80%93_broadcast#US_implementation_timetable https://en.wikipedia.org/wiki/Automatic_dependent_surveillan...