I have difficult ranking those because a lot of them are non-negotiables for me. Is "A" more important than "B"? No. But "A" is certainly
as important as "B".
Using the list above, for example, I would rarely fly an airline without 7 and 9; but by the same token, 1 and 2 are so very important. Would I fly an airline without 6, even if it excelled in 1-5? No, probably not. I guess what I'm saying is that my rankings are "different", they're just not possible.
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"There are those who travel, and those who travel well."