I can't help wondering, to be honest though - don't you get kinda bored doing the "same" thing in every game? Is it really a challenge? Don't you every have the urge to start somewhere small and build up a smallish, efficient 2nd tier airline like many other do? Not criticising you at all - just wondered.
I allow myself to answer this because his and my gameplay are similar.
Are you a follower of a sports team or a athlete? Football? Tennis? Olympia?
How often these people think "oh, today I'm not gonna go for #1, a perfect #16 would be much more interesting!"?
How about your school time?
You ever tried not to get the best mark?
That's how things are. What's the challenge to choose a smaller airport like Port Moresby, get 10-20 economical props and maybe 5-6 narrowbodys for longer routes (what could be done in 1-2 game years, maybe faster in modern times) and then... wait ~20 years till the game ends?
Honestly the challenge to run a very big airline top airline is more challenging. Nobody is interested if your small regional airline has statistics spot #244 or #263, where there is a big difference for big airlines all from #1 to #20. It's not just get some random aircraft and throw them on some routes. And one has more often something to do and not just wait till game world ends because expansion is extremely limited - or at least expension is limited much later into the game.