I was with you until you got to Lockerbie. There is no way to classify either the plane or the town as a military target.
You're right. I was thinking of Gander which never was resolved. But it had left the M.E. and was at least suspected of being such. My mistake. BTW here is an interesting link on attacks http://www.state.gov/r/pa/ho/pubs/fs/5902.htm