Originally Posted by
corporate-wage-slave
It's the Rockwell Collins Airshow (I think the 4200 series). It's been on some short haul for a while now, certainly a year, maybe 2 years (?).
It's been on the 321s for a good 5 years now.
Them appearing on 320s must coincide with freshly factory delivered ones that have made their way into the BA fleet recently.