More real Aircraft related Parts
Little windows and doors
More landing-gear options like for instance the A380 to make maingears with more wheels and let them swing.
Smoke when touching the ground
More different enginemounts
More Engineshapes/forms (B707;B737-8MAX;B787-8;MD-11;A340-200/600)
More realistic wingshapes (easier to make)
More lighting options (Logo light;Landing lights;Front-gear light)
just a Terminal and a jet-way.
Thanks for reading. :)