dunno if enemy had los because of it. Looked extra silly.

There is Vamps battle near 8:40.
Some of the planes start crashing in a strange way - they fly horizontally without falling down at all. One of them flies over the whole map (from south to north) before it crashes, while two others fly outside west edge of the map, flying in crashing state until they leave field of view.

Near 12:00 bugged Vamp gets noticed.
It belongs to Meep and keeps flying in enemy territory near Fortaleza vamps. It has Attack order on one of the Fortaleza vamps, but doesn't shoot, just follows the target vamp. Nothing is shooting at the bugged Vamp either.
The bugged vamp can't be selected, but can be pointed by mouse to view tooltip. It has full HP and is not in crashing state.

Later Fortaleza sends the Vamp which is being followed by the bugged one, into enemy territory. After the followed Vamp dies, the bugged Vamp just starts flying over the area as it doesn't have any other orders.

The end.

Bhaktivedanta said the bug most likely happens when a plane in crashing state is given to another player (which could happen because of Lag Monitor).

It could be that one of the crashing Vamps which flew outside map, is given to another player by Lag Monitor, which causes the crashing Vamp to recover and it starts attacking its last target, flying back to the map, and then gets noticed once it is in enemy territory.

I submitted a bug for this a while ago.

http://code.google.com/p/zero-k/issues/detail?id=1723

Oh. Hmm.

One solution would be to have a timer on death animations, and if the unit hasn't died after some time (lets say, 10 seconds) it just blows up in midair. Seems plausible that a heavily damaged aircraft would blow up, and it fixes a lot of these death animation bugs.

Faster to find what GoogleFrog wanted to post.
http://springrts.com/mantis/view.php?id=3476

But even with planes not begin shared any more, that still a but with the planes that is forever "death" in falling mode but never hit ground, so i think Antelope need to be implemented too.