Chris_DeltaCustExp, thanks for your response.
One question about the A320: Are there plans to install AVOD on these aircraft? Also, what model of seats will these aircraft be getting? I presume the seats will be the same model as on the A321s (which I haven't heard any info on yet).
In addition to the Zodiac/Weber 5751 and B/E Aerospace Pinnacle, other options include the Recaro CL 3620 and the Aviointeriors Columbus Three. I don't think Delta nor Northwest have ever purchased an Aviointeriors product before; I know some ex-Northwest aircraft have Recaro seats, and the 75Es currently feature Recaro seats in BusinessElite (although they are leased).