| The anticollision device in the plane's cockpit detected an approaching aircraft and issued an alert, said Chris Brathwaite, an airline spokesman. |
| It can evade most radar, but is generally visible to anticollision devices. |
| Vision-based anticollision systems normally require two cameras because, like human eyes, they use stereoscopic triangulation to judge distance. |
| They have anticollision devices that talk to the corresponding system on other airplanes and decide which plane will climb and which will dive. |
| The United States National Transportation Safety Board has attributed the crash partly to the cockpit systems' failure to alert the American crew that the jet's anticollision equipment had failed. |
| Features like a radar anticollision system and start-stop function will be standard, Mr. Zetsche said. |
