If you book through DL, you'll have no problems (and *should* get miles for it as well). I wouldn't book through AZ/ITA though, as they aren't quite up to the mark yet on support. Call centre is helpful, but there is only so much we can do: I cannot tell you how many times I've heard, "mi displace Sig. TATLTAIL, ma siamo appena in operatione e quindi..."
If the hard product is like former AZ, you'd do wise to book this way: much better than DL J service