Plane 1 isn't airborne yet, so I can't include that in the AIrcraft in Flight DB.
Plane 2 is airborne, but has already been collected.
Plane 3 is new and will be added to the DB.
Plane 4 has already been collected.
SInce you're obviously a keen spotter, it might be a good idea if you downloaded the latest copy of the AIrcraft in Flight files - this will help you to see where an aircraft has already been recorded. I'll be publishing an updated version in a couple of hours.
Again, could I ask you to remove any redundant placemarks.