Just in case anyone's interested, here's a link to a DL chart with the number seats, number of premium seats, range, etc of different aircraft types.
https://www.delta.com/travel/plan/ai...ypes/index.jsp
has details on seat pitch and map too
and
http://www.airelite.com/charter05.html#
click on DL commercial a/c and there's some out of scale pictures of each.