Ah....well no, not that I remember anyway. I mentioned this to SQ management at the time,and although it was not in their ops manual, the manual was changed (big surprise) to reflect the Boeing recommendation. Less possibility of downwind drift, I suppose. PanAmerican also used this technique and it was recommended during their contract training. As PanAm had the most experience with the 707, it may well have originated there. Increased the required runway distance by about 600 feet as I recall.