The return of Concorde for those of us who just weren't in a position to fly it when it was operating, and some well-appointed Gulfstreams on the BRU route
And yes, the 747s simply have to go.
Boeing, Airbus, meh. It's all just much of a muchness with nothing in the way of wow factor.
The missing bit of the jigsaw in my own personal travel sphere is actually coming along - namely Crossrail for a smoother trip into St. Pancras for the Eurostar.