The problem with unions at the regional level isn't concessions... it is that new FOs can't vote. That is my explanation for why we get paid .40 cents more to fly a bigger airplane while a first year captain gets 10 dollars more. That is a 2% difference for us and a 20% difference for them. One great term that I've heard to describe this phenomenon is that the union eats its young. Another is "I've got mine, who cares about yours."