Seats abreast not one after another on AY
 

Just flew with Finnair, which was a pleasant experience. Noticed that the seats abreast are not one after another. For example, it went A, C, D, E, H, J, L.

Anyone got an explanation at to why? It was an A330

Probably to keep the same "meaning" for a seat between aircraft with different seat layouts.

Say they have a 3-5-3 aircraft and also a 2-3-2 one.

So the seats on the 3-5-3 get labelled:
ABC_DEFGH_JKL

Then you might pick
AC_DEH_JL
for the 2-3-2 configured a/c.

That way the booking people know that seat C is an aisle seat, regardless of the aircraft.

Likewise with many other aircraft...and airlines.
Nothing new.

Makes perfect sense, thanks. All those years sitting in the pointy end of an RJ and it is first now that I noticed this on a wide-body.