I like the tail on A but the fading needs some work. B is just too conservative. Also, is there a need for "Airlines" on there?
I just thought the fuselage was way too empty with just the small "United" titles, and I also think it does make it a bit more upscale to spell out the full "United Airlines" on the side.
Anyway, what if I just get rid of the fade on the tail? I've also improved the metallic paint effect (think a lighter JetStar):