I completely second everything said here. We need more features, mechanics, and quirks to the game, as nice as new airplanes and airports are, they inherently don’t change the gameplay, and as much as I feel bad saying it, cause I do love this game, as @CJ_RVWilliams said, the gameplay is honestly becoming pretty dry and repetitive.
We really need something to break up the monotony, whether that be other forms of aviation such as general / corporate / military / etc, new challenges, more multiplayer features, whatever, we just need more variation in gameplay tbh.