How did I never know about this? I’ve been using SeatGuru for years, but I don’t find itearly as useful as it once was. It turns out there’s a much better source for airline seat maps.
A ‘LOPA’ is a Layout of Passenger Accommodations. It doesn’t just show seats. It’s a detailed schematic of the passenger cabin that’s drawn to scale. And there’s a site that has these for a number of airlines, both foreign and domestic.