APU for 2+hours

Is there a reason to keep the thing running when at the gate? Certainly never been in a 380 but they never shut it down from block to block. I’d of thought they’d have ground power available. ECS?

Is there a reason to keep the thing running when at the gate? Certainly never been in a 380 but they never shut it down from block to block. I’d of thought they’d have ground power available. ECS?