finally did a few tests:1) i didnt do detailled things, just a rough check if it "looks good", didnt go into every range-subtype or something like that
2) lots of earlier designs seem to have really comfy interiors (i guess thats due to the change in the industry)
3) to make more detailed checks we would need to know how thick the seats are (seats nowadays are much different than 20, 30, ... years ago)
4) didnt check any soviet designs (noone uses those anyway

)
notes on what struck me as odd / or looked good:
F70/100: seem good
F27/F50: all eco, they have 4 abreast seating and 39in pitch... that seems excessive
HS Trident: one cant reach the "maximum seating" in the trident by far! probably because maximum seating on those utilized 7-abreast seating, which HD seats dont do in AWS
DC-9: -10/15/21/31/34: no way one can reach maximum seating. i cant offer an explanation on that one... but tried with 27in pitch; 41-51 ok
MD80/90: looks alright
MRJ: looks alright
Saab 340/2000: looks alright
Caravelle: a lot of excess space... 40 in pitch
Superjet: looks alright
VC10: looks ok
Viscount: 40 in pitch
Martin: looks alright
Connies: early one look good (a bit comfy) - 1049/1649 have excessive space
Elextra: looks alright
JU52: good.
HS748: looks good, but the ATP has excess space
HPH: ok
528/728/928: quite some space
ERJ: ok
EJet: ok
DC8: ok
DC7: lots of space...
DC6: ok
DC4: ok
DC3: lots of space. in AWS there is 4 abreast seating possible... IRL the DC3 gets lot narrower in the back
DC2: four abreast seating in AWS, IRL it was much narrower than the DC3 - according to wiki 66 inches wide.
328: looks ok... maybe a bit cramped
Comet: looks good
DHC3-8: look alright
Mercure: ok
C46: ok
CV240-440: lots of space...
CV880-990: very comfy
C919: ok
CARJ: quite some space
CASA: looks ok
Brit: quite roomy
Breguet 763: i thought doubledeckers are not included yet?

DHC8: ok
CRJ: ok
757: ok
737: 400 cant reach max capacity; 7Max too
727: ok
717: ok
707: 300/400 cant reach maximum capacity. 100/200 and 720 ok
377: ok
146/avro: ok
Jetliner: ok
Aviation Traders Accountant:
i am getting problems on this one - cant see data please check!
ATR: ok
A320: ok
A220: ok
Concorde: ok