Looking back on your airports past
With the possible additions of better screenshots, a timeline of every game save would be a cool in game feature. This would allow players to take a picture of their airports, and to list accomplishments to see later. This should happen after a certain amount of time passes. Players will view this in a timeline, allowing them to look back on their accomplishments. There should also be a place where player says what their next goals are.
Why it should be implemented:
So when players feel like they are finished, they can see their accomplishments, and feel great.
Images, references or additional content:
Puma suggested that this be put into to separate feature ideas. The other is the high resolution screenshot.