I'm going to Berlin for the first time in a week. I leave 12/31, flying PHL-ORD-LHR-TXL. I'll spend the afternoon of the 1st, the 2nd and the 3rd there, and then return on the 4th. Too short, I know, but better than nothing. The trip to LHR was $380 (have upgraded to Business) and used miles from LHR to TXL. Can't turn that down!