And what makes you think it's a sub launched anti-aircraft missile and not a surface-to-surface cruise missile? I won't even justify the drone part with an answer.
Or, it could have been a missile fired from a small boat (like the one reported to have fled the scene right after the explosion of TWA800).
That would shoot your whole subsurface to air missile theory right out the window wouldn't it?
I'm not saying that it WAS a sub launched missile. I said that it was possible. I also said it could have been DRONE. It could have been a missile launched from a SHIP, or a decent sized boat (like the 50 foot or larger boats the drug runners use. Like the one that SPED out to sea right after the explosion of TWA800). It could have been a missile launched from the shore somewhere.