Muppit,. .. .A great suggestion, but one which assumes that the operator will have performance data other than runway-specific. easyJet is not one such - they only have data for runways they use and intersections which they have calculated for. Such data is produced on a cost-per-calculation basis (and sometimes, a licensing fee too).. .. .That's why they can't use the TORA/TODA to make their own calculation.