Thanks! I actually had the check this out in G wallet to realize, that what is being discussed here is that one little number I have often wondered what it means!
I never cared enough to research it, because it never seemed to actually mean anything important (and to me, well, it still really doesn't, it's more of a statistical thing, but I do find it interesting that Aegean's turbo-props have had such insane weight restrictions during bad weather, you'd think if it's bad enough that only 3 people are allowed to fly, then it should probably be cancelled all together).

tenerani1 and @ all you can certainly see that number on your boarding pass in the Aegean app! That's at least where it's always caught my eye! And if you hit the 3 dots on the bottom right corner ("More") and then the boarding passes icon on the top right, you can even see past boarding passes there, all details still included.

Funnily enough, I've been nr. 12 quite a few times (for some reason when check-in opens at 48hrs before departure, it doesn't actually work until anything between 2 and 8 or even 10 minutes later, don't know what that is, but now I'm curious to see if using the amadeus check-in elsewhere will actually override this issue).
I've also had two 3's and a 4 in the last 2 years, but never a 1 it seems, even though I'm right there, the moment check-in opens ​​​​​​.