And how does the tug get back to stand down the full up taxiway?
Diesel powered tug too. And how much burn off does a modern jet engine consume at ground idle compared to a long range flight?
It's an headline grabbing idea but the practicalities will need some thought.
How about all Virgin Atlantic engineers agreeing to use FEGP instead of GPUs and to turn off all the APU once all the pax have disembarked. Oh and only start them back up when needed for boarding.
And before any outraged Engs hit back, I used to tell a certain station eng about this weekly. Until I got a proper job
Sir George Cayley