I have often heard that US domestic carriers provide lower quality than international carriers, but in my limited experience this had not been borne out. I have taken a few intra-Europe flights on KLM - I think that KLM has a nice reputation. The first class seats were virtually identical to the coach seats, something that would be unheard of in the US, unless on a commuter plane where there are no first class seats. The only advantantage that I could think of was that alcoholic drinks were free on KLM. I would much rather have a lower cost ticket and people pay for their own drinks.