A use on Google Earth Blog has found out the planes in this file is a fake. This is what is written in GEB:
What started out looking like a pretty cool find of nine small planes in flight in near-perfect formation, was quickly determined to be a fake. At a lake about 35 km west of Copenhagen, someone photoshopped this formation of what is apparently a single plane before the photos were supplied to Google. So, anyone can see the faked formation (at least until Google removes them).
If you look closely at the aerial photo you can easily see that the water around each plane is identical. It only took a couple of hours from the time someone posted the exciting find, for experienced GEC moderator 'Hill' to recognize it was fake and point it out.
So you can move it to Outdated Files. :)