M.K.
I have never flown to denmark, or with this airline, but we just came back from the Uk, and I didn't take my car seat on the plane. In fact I hired a car seat with my hire car, if you go with Hertz they have britax car seats.
If I hadn't have done that, I would have checked my car seat for sure, taking them on the plane, to me is a big pain in the bum.
my daughter is 2, and sat in the seat just fine, kept her seat belt on, we had turbulence, but there is never so much that a regular lap belt won't work.