I think it does...
It has to be related to motivation: Under all the other circumstances remaining the same; I think a crew that see a georgeous livery will feel more commited to "match" that image and then it will afect it.
Another way of saying: If you worlk in a office, hospital, hotel etc. Can you say it matters nothing how the building looks outside? Wouldn't you feel better if it's a nice building, well painted and clean? wouln't be kind of sad yo work in a gray old building? and since sad, don't you think that effects the mood?
I do think it matters. Although as I told you: if the best livery airline pays half the average, I'm sure the nice colors won't make the difference. But, ceteris paribus, it does.
in order: 721,146,732,763,722,343,733,320,772,319,752,321,88,83,744,332,100,738, 333, 318, 77W, 78, 773, 380, 73G, 788, 789, 346