Hi, the 74 classic and the 744 both have pronounced ground effect below 50 feet. In the 744 it is much more obvious such that a more gentle pilot input is required during the flare when compared to the 74 classic. This effect can be experienced from 100 ft on the 744. There are no funny electronic inputs in either aircraft with the possible exception of the fail passive (two autopilots only) autoland system when a slight nose up trim input is sent during the flare to cater for the possible loss of the penultimate autopilot. This feature is not evident on a fail active (three autopilot) autoland. Can't speak for the 777.