TextureArrays and Opacity

So, I’ve been messing with TextureArrays lately. I now have enough textures that I’ve got a few that have transparent sections, as with some that do not.

TextureArrays need only one image format, and there are two - the ones with an alpha channel, and the ones without.

So my question is, how am I supposed to fix this? Two textureArrays? Or is there an easier alternative that works well?

One texture array for each format.
Thats the working solution.

//Just as a note: the textures also have to be the same size

or inject a empty alphachannel into the others in gimp or similar.