"What's that stench?" That was the question hundreds of travelers were asking this morning as they boarded United Flight #394 to Denver. Indeed, an aroma combining the worst qualities of Diesel Fuel and Bilge Water seemed to permeate the cabin before takeoff. "Something really stinks," I said to the woman sitting next to me. "Just so you know, it's not me." "You're right," she sniffed. "Maybe it's coming from the Galley!" To be safe, neither of us ate the complimentary "Trail Mix!"