Originally Posted by Probe

James,
Fast forward 25 years. We now do those same departures every day, but usually at reduced power. We have "normalized" using all of the available runway, in the name of saving gas and maintenance costs.

Take off in a Guppy NG at severely reduced power on a 12k foot runway, lumber into the air 10k feet down, cross the threshold lights at 50 ft, then you get a big increase in power to throttle up to climb power.