Both Delta and United have some pretty lucrative Rewards Network Dining opportunities right now. United is offering 1,000 bonus miles for every $100 spent through June 30 at participating restaurants with no limit (register here).
Delta is also offering 1,000 miles for every $100 in Rewards Network restaurant spend through June 30, with a limit of 5,000 bonus miles (register here).
In both cases the $100 requirement is a cumulative amount, so you don’t have to spend $100 in one shot. So if you spend $30 at one restaurant and $70 at another, that would qualify for the 1,000 bonus miles.
The only thing missing is a half decent Rewards Network restaurant in my neighborhood…
(Tip of the hat to Gary)