Just saying it's a bit boring to start every time in the 1990s or 2000s with OLD B737 planes!
There's 9 worlds that start before 1990, and there's a majority within that where the 737 isn't even the best to start out with or just straight up not available. Play those instead if you're tired of starting in 1990.
And as explained earlier, there's a lack of airplane data past 2015. You would just be working with today's aircraft and nothing more.
iirc there's also a hard limit that every airliner stops production in 2040, so it would either have to be a shorter world (like the sandboxes) or start in 2010 where you bet your ass there will be an option for the 737 as a starter plane.
P.S. I know I'm requesting too much while this game is free, therefore I wouldn't mind paying some monthly fee to be playing it in a more realistic and modern way :-)
Not even the main problem, it's just that the game has been developmentally stagnant for a damn while now.