If any operator or airport based any decision on the 'Normal' rating characteristics i.e. 3,100m for B742 ops, I'd be the first to kick their arse from here to breakfast time.
They, or their performance engineers, would be analysing the route, checking distances, takeoff obstacle limitations, temperatures at takeoff and en-route, winds en-route weather, fuel loads, alternates, holding fuel, cargo, onboard spares, OEW for their particular aircraft, and pax loadings, as well as runway length, gradient, surface, and wind statistics. Then if they got an answer somewhere near 3100m, they might mutter that 'overrun's table is the living proof of how the dumb can occasionally luck out with the numbers'. Air France 747-200s might use 3100m out of CDG except when they return from Johannesburg using 3600m or when they fly to TelAviv using 2600m or fly out of St Maartens using 2072m
http://www.airliners.net/open.file/201517/M/