If you've seen old-timey photos of aviation in the early decades of the jet age and wondered where all the glamour went, you've been flying economy. When airlines change the back of the plane, it's usually to pack in more passengers or install something you can give them money to enjoy. For those who turn left as they board, life aloft is swankier than ever. But last week at the Aircraft Interiors Expo in Hamburg, economy fliers got a bit of good, if not quite glamorous, news.