J/F seats are as follows (Included Y if there are any skipped letters as well (besides I, for obvious reasons)):
CR2: (Y: AB-CD)
CR7/CR9/170/175: A-DF (Y: AC-DF)
145: (Y: A-CD)
S80: AB-EF (Y: AB-DEF)
319/320/321: AC-DF
321T: A-F (F), AC-DF (J)
738/752: AB-EF
763: AB-D-HJ
772: A-DH-L
77W: A-DG-J
788/789: A-DH-L
This is why in domestic F, if someone is in the wrong seat and that person has a B/C/D/E seat on their BP, I'll give them the benefit of the doubt when I kindly ask them to please move to their correct seat. But if someone has 1F and they've poached 1D, then git. Now.