Well, there's a thing.

When flying on VS, their priority luggage worked... Mostly. Some airports not so much, but largely, Upper etc's bags came out first on the belt.

On BA, I'd forgotten that they were supposed to come out first, after about three years of flying from T5.

Then I flew from T3, seemed to be normal non priority on the way out to PHX, but on way back from DEN, ours was out very early. Could have been a coincidence, but a combo of BA T5, and airports, but seems to work better from or to T3.