Og, you may not like this news but my ticket US-Australia (we are off in 2 weeks) was just issued by AA with not just lastname/firstname, but lastname/firstnamefirstmiddlenamesecondmiddlename. And it was just about that many letters. Their comment was that even though the whole name didn't fit, they still needed it. Kind of like my green card which cuts off mid way through one of my names and the INS say "that's fine, sir." It is freakish over here. Personally, I would belly up passport in hand and I am sure you would carry the day, but if you are nervous then get the reissue done.