Last week during a same day LAX-DCA-LAX MR on an absolutely empty 757 I had the row to myself on LAX-DCA and slept the entire way. Upgraded on the way back. I tend to always do the trans-con mileage runs to Boston and DC in the first two weeks of December (of course), and always do the same: coach there and First back. Saturday morning flights in the lull between Thanksgiving and Christmas are always empty in my experience.