@manabi I second this, ch. 1 already tells us that the current timeline is farther into the future than us. The flashback timeline definitely isn't WW2, their cars and laptops should be further proof of this. It should be around our time, and the current timeline should be some decades after.
However, to be nitpicky, I disagree with
@Oured that AI is advanced enough already to take on the fighter pilot role. We are getting there, with the examples he's put out, but not yet there. Here's a good video that explains why replacing the fighter pilot is particularly difficult and what the current tech attempts are: https://www.youtube.com/watch?v=zZt85aMPp6Q