I live near a major airport and see commercial planes with huge front headlights shining in the night sky. What could they be good for way up in the sky, though? I get that when they are taking off/landing headlights are necessary. Why not give them lights like a boat, with a green in front and a red in back?
airplanes are routinely told to watch for a traffic in their vicinity. also, aviation is all about procedures and backups, so if someone makes a mistake, it is good if there is another link in the chain to prevent accident.