I looked at all the planes on the FO side in ATL. Didn't write it down and my memory is just meh but here's what I recall.

777 -- 100% blue days
765 and 717 -- mostly blue days (go figure, 717 blue days...)
330, 73n, and 320 -- mostly blue days except weekends
7er and m88 -- almost no blue days

I've got 29 PB days burning a hole in my pocket but for now it looks like I'll be eating those for vacation.