To return to the factors in the Ottawa over run, I am constantley amazed by those who maintain whatever they have as an increment over the normal V App right into the flare, instead of letting it decay as one gets just short of the threshold, {no one ever did any harm if the bottom drops out at ten feet} and then compound the problem by holding of on contaminated runways feeling for the "smooth one", the "T" effect takes care of any nasty things hapening as one gets back to V App one the aircraft is down to about half its wing span above the ground, but some operators seem blisfully unaware of this when teaching , maybe agrevated by the Airbus "Retard" call out which doesnt seem to understand this minor detail in large aircraft aerodynamics. Add all these factors up and throw in high idle forward thrust and no reverse, its a perfect mix for more overuns, lets not even go into the training standards in some of the US comuters.