Pie in the sky. Pipe dreams. It's Swedish (I think) for "air castles." Silly far-fetched dreams.
Richard Perle: I can save my reputation as architect of the disastrous Iraq war by blaming everything on Bush.
Historian 200 years later (laughing sagely at this example of Neocon luftslott): Yeah, uh huh, and Iraq was ready for democracy, too.