in most airports like LFPG, LEMD the computer generated traffic during landing when it arrives at 800 ft it disappears and on take off it only appears after 700 ft when you are getting close to the runway to take off, at other airports like EHAM, EDDF the traffic sinks to the ground when landing and before taking off
I only founded two airports where traffic is normal: Düsseldorf and Gatwik