Question: how many frequent flyer miles to upgrade to first class on delta?
Answer: For domestic flights, you'll now be able to upgrade L, U, and T fares. However, it will cost you 30,000 SkyMiles one-way. To put things in perspective, SkyMiles domestic coach awards start at 25,000 miles round-trip, so you'd be using more than that just to upgrade a one-way flight to First Class.