[quote=@Mihndar]
<Snipped quote by Willy Vereb>

Thanks. Yeah, I more or less copied and pasted from the old RP so considering some people have early jets and the like I'm probably going to beef up my airships along those lines and increase my navy as well. The primary strength of the PRK will be in our spy networks, naturally.
[/quote]To be fair, I don't think many nations want jets for now.
Yllendthyr can get away with this because they have mithril at nearly the same cost as steel which means cheap engine materials as well as the fact the aircraft itself is lighter (mithril is denser than wood but you can make a milimeter-thin layer of metal and call it a vehicle hull while the same can't be done with wooden constructs).
Jets in Ww2 era have a number of issues. Perhaps motivated by Yllendthyr's success at making them others would make special aircraft with jet engines but the mainline propulsion would be propellers still.
They have several advantages over jet engines, especially early and WW2 era ones.