With the promo released today:
spend $200 500 bonus miles
spend $700 2,000 bonus miles
spend $1,600 4,000 bonus miles
I am thinking that even at 1x buying some of the $100 discounted gift cards -- or, at a slightly higher cost, the $250 ones that can be used on Apple Pay -- might be worth doing. The T's and C's of the promotion exclude gift cards and other cash equivalents, but IIRC the giftcards.com purchases have counted for past redeemable miles promotions. Does anyone else remember whether those have counted in the recent past?