Ultimately, I will cast my vote for Option 1, because I do think it presents a clean look and feel complementary to the intended alliance image.
However, I would like to see some modification of the alliance logo placement. Currently, the majority of the options go towards a Delta-esque implementation on the tail, which I personally don't think suits the logo design. I believe Option 5 implemented the Delta-esque tail design best, although I am more impressed with the design leading towards the tail (sort of SkyTeam-ish, I would say).
Another point of issue I take with Option 1 is the inclusion of the tag line. As far as I know, most alliances do not include a tag line on their livery, and it honestly makes things look more cluttered. Removal might be worth discussing.
Finally (and this might just be because the KLM logo is unusual), the alignment of both the member airline name and the alliance name does not appear to be consistent on all three aircraft. Would this be resolved?