So the reason i still have propeller driven aircraft yet the year is 1960 is because they abandoned the project of jet fighters due to how much jet fighters would cost, how much parts they would need,the amount of time with maintenance, so on and so forth so they abandoned them, thats why they stayed with propeller fighters oh and to explain some of the jet fighters, there was only a handful of them such as the DI-249,the DI-162(i have yet to upload) and i think you can guess what aircraft the di-162 is based off of with just the three digit number. Also in a later forum ill be explaining some lore so yeah look out for that.