Any idea why there is such a disparity in seniority between A320 CA and 737 CA, namely in LAX, DCA, and MIA? At least on the bottom end, 737 is way junior to the 320. Being that both aircraft pay the same, it is surprising to see such a disparity. I know the 320 is a nicer and more comfortable airplane, but that alone does not seem like enough to cause such a seniority difference. Any thoughts?