Originally Posted by
Mr. BoH
Just noticed that the CR9 seats on Aerolopa are labeled ABCD, but the actual seat lettering is ACDF. Or at least that is true for the plane I am on today.
Conversely, it appears that some (all?) of the 738s have ABEF designations in domestic first, at least according to the seat maps on the AA website looking at a few random flights. aeroLOPA shows ACDF.
I'll just add that these seatmaps are such a great resource. Thanks again Prospero!