Right now, the vertical separation minima for aircraft worldwide are not conditional on size. At altitudes above 28,000ft MSL, the minimum vertical separation is 1000ft, even for superjumbos. It is probably a rare event that two aircraft come so close both vertically <i>and</i> horizontally, but I wonder if there will be a rule change because of this incident nonetheless.<p>By contrast, the <i>horizontal</i> separation minima vary dramatically based on the size of the leading aircraft.