Review/comments

Overall, I like this page - I think it's well structured and mostly clearly written. Couple of comments:

First, a very minor thing: I think in the problem definition you are a bit inconsistent with using $d$ versus d (ie math-mode versus not). Not a big deal but just noticeable when reading it.

I found the General Additive Utility definition a bit confusing - it's not completely clear how it is different from Additive Utility. When first reading it, I thought that the distinguishing feature was that, in general additive utility, "the user should be indifferent between any two attributes with the same marginals on each factor". After reading it more closely, I think what you're saying is that this property holds for both types of Additive Utility, and the distinguishing feature is expressing it with scaling constants? I think this could be written a little more clearly.

I liked your example comparing the utilities of different flights, but think it would be nice if you gave an example of what the question Q^1 could be. I'm currently struggling to think of what Q^1 could result in e.g. P(Q^1 = yes | u=u_1 ) being 0.8, and not just always 0 or 1.