I thought I might finally apply for this (and keep for the first year at least) when the double miles promo came out. But it seems my 40k bonus offer has expired already and they don't tell you how many bonus miles you'll get for applying.
I do have an active offer for 30k bonus but from Delta only. Do both the NW and DL marketed offers work with the double miles promo if one is still earning through Worldperks?
There's no phone number or email I can find to ask these questions of the Amex marketing folks.
Debating whether to hold out for another 40k offer (they only offer one lifetime bonus for these devalued sky/wp miles, right?) or just forget about it, as I am a lot less enthusiastic about earning wp miles than I used to be.