Often, I am a bit slow, and some of us don't have time to use the search engine. I hope you respect that!
Anyway, I've only just noticed that the latest Air Berlin 738 uses the customer code "08" which is, if I'm not mistaken the customer code for Icelandair.
So, what I want to know is:
Is it leased from Icelandair?
Did Icelandair order 738s but didn't take on this order and the planes went to Air Berlin?