I’d like to suggest expanding the use of fifth freedom flights and adding more less-common but real-world routing options to the game. While there are already examples (such as British Airways operating London–Sydney via Singapore), many airlines operate additional fifth freedom routes that aren’t currently represented.
Including more of these flights would greatly improve realism and variety, especially at major international hubs. Fifth freedom routes are an important part of real-world airline networks and would add more strategic and immersive gameplay by allowing players to simulate realistic airline behavior beyond simple point-to-point routes.
Adding a wider selection of these routes, possibly limited to specific airlines or airports, would make traffic patterns feel more authentic and dynamic without overwhelming balance.