Originally Posted by
Traffic_Is_Er_Was
Only the first one. All the others get delayed by the tugs clogging up the taxiways returning to the aprons.
Plus, what if you have start problems? Do you want to find out close to the apron where you can return for engineering, or 100's, maybe 1000's, of metres away at a holding point, blocking access for everyone else.
How is it any different from taxiing out on one engine like we do already and then having start problems starting #2 or #3 or #4?
Just like anywhere else if an aircraft has issue while on the taxi out then you get parked in the penalty box, de-ice pads or elsewhere.
Personally though I can see the concept of electric motors on the wheels for ground taxi being a better solution than the logistics of tugs in the long term, just my own opinion without any solid data to back it up at all.