Hello IPACS,
The 777 A/T is a bit off, it should automatically disconnect (as in the button light extinguishes, NOT disarm) 2 secs after touchdown. It's a bit like the new 737 max, which is modelled correctly, just without AT disarm.
As for the 747 and 787, I couldn't find enough data to draw an conclusion but it should be similar.
Thanks!
