Row 18 on the DEF side doesn't recline. I had the pleasure of witnessing this first hand on ATL-LAX on Wednesday.

The seat itself isn't all that bad. The IFE is excellent which is leaps and bounds better than the dark UA 739s. The restroom situation in the back is quite the hazard.

DL did the best they could with this plane. I just don't like the 737-900 in general.