Upgrade runways size
I think the ability to upgrade small and medium size runways to larger ones would be a good option like how you and approach lights. Click the upgrade button then choose the next size up. You can limit it to the next size or even allow upgrade from small to large in one step of wanted but can see the reasoning behind requiring small-medium-large and not small-large.
Why it should be implemented:
With the limited map space you do not always have the real estate to plop down another runway and closing, destroying, and building a larger runway takes alot of in-game time and financial hit on your airport do to the lack of flights coming in
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