Hello,
If you’re looking to apply for the airport editing team then I strongly recommend taking a read through this topic linked below:
In regards to talented users designing aircraft for the game, there is already a team of 3D artists and developers that create and code the aircraft models that we have in game to ensure they are up to the standards that us as Infinite Flight users have come to appreciate.
If you would like to contribute to the app, then joining the airport editing team is certainly one of the best ways to do so.
Let us know if you have any questions!