> But what if you don't know about other online travel sites? You'll never see them, so it kind of makes sense that you are shown other sites in there.

I don't think that makes sense. Or, at least, such results should be below all the actually relevant results.

If I'm searching for Expedia, then what I want is results about Expedia. Nothing else. If I want to know about other travel sites, I'd be searching for "travel sites" instead.