Zuperman ,
VonHulk, Lowdan Clear and I have now each reported, in separate instances, players who somehow had the ability to become completely invisible, both in plane and on radar, and have ended games. All three cases were different players.
I ran into the pilot I reported recently. I asked him how he did it. He said he had no idea, the server had glitched, and he couldn't see us either. He was there, running full speed with both chat and with the kill-feed (ruling out lag), but he was just invisible. I was able to watch a bomb materialize out of thin air and land on my base.
Please check this out, and correct it as ASAP as possible. These players can win bombing missions at will.