Really nice, definetly looking forward. But I have to say, I am going to miss the manual runway extension, I really loved this feature because it really helped me when building real-life airport remakes. But I understand why you will be removing it, tho I would also love to see it saved somehow. Also really like the new entry points mechanic. What I would really like to see, and would be just a minor addition, are destinctive runway markings for each of the runway sized, like those shown on the pictures.
(Adding the L/C/R designation would also be pretty neat.)
This would be an example of how a small paved runway could look like:
(I think we can all agree that small planes do not need precicion touch-down points, as it is in real-life.)
Another great thing would be an addable blast pad:
Also make sure to also add grass runway entrances, those concrete and asphalt ones are really bugging me.