I personally think that the next thing to get reworked after the 777-200er should be the airports. For example actual terminals and also on the runways there should be skid marks from landings. At LAX the taxiways have green on the sides which is a cool addition.
I also think that they should add buildings/terminals. At LAX they have the old ATC and the new one and this is a cool part of LAX. The final thing should be skid marks on the runways.
Another thing that I think should be added should be skid marks.This would add a lot more variation and variety to the runways and airport.
I know this would be a big task but it would be really cool to see happen. I used LAX for my examples because it is one of the biggest airports and I really like it and its design. If this could happen it would make the game look a lot better.