We'll, I started 6 game months ago in Jet Age, mostly because I screwed up at MT3.
But, it is possible to still create an profitable airline, and there are LOTS of good starting airports available. Many big players has quit recently, and that allowed me also to manage a nice airline.
Atm I have little under 30 A/C, and more to come. My monthly passenger count is also over 200k (I know that ain't much, but as I said, only 6 months behind).