Delta has a limited time promotion where you can earn 3 miles per $1 spent on any Airbnb stay. Usually you would earn just 1 mile/$1 at Airbnb, so this triples your miles. Delta and Airbnb partnered together back in Novemner 2016, but keep in mind that they also have partnerships with Virgin America and Qantas.
To take advantage of this promo, you must book by April 30, 2017 and complete your stay by April 30, 2018. Bookings must be made through deltaairbnb.com.
This should also stack with the other promo for an extra 1,000 Skymiles, assuming it works for those who weren’t targeted. Make sure you register anyway.
If you don’t have an Airbnb account, you can use my referral link that will give you $35 after you first stay of $75 or more. That’s better than the Delta offer of 2,000 miles after your first stay of $150 or more.