That’s interesting for sure!
I personally don’t see this feature as something I’d like to see in the near future, but it could spicy some things up.
If you need help with typing some texts in English, I’d suggest typing your ideas in a translator, then paste them translated into the forum (I personally recommend DeepL).
Have a nice day! 
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Besides me not liking even having seat classes, i think this is impractical for another reason. Premium economy has the same or very close to the same seat density as regular economy. And maybe extra weight if it has nicer TVs or whatever. So adding premium economy seats wouldn’t really decrease weight and increase range like business and first seats do.
In real life, premium economy per area seat is much looser than basic economy due to both the number of seats per row and the length of the row. Since we are talking about premium, not extra length (which has the same width), this make real difference. Think about the 216-seat High-J 787-9 and 315 all economy seats- these are not only different from business class. Also, per area revenue is much different, which will create some special routes that are not economically feasible in the game.
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Thats why it will bring more strategys to the game. (i think)
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