I want to take medium planes. But when I allow to medium planes landing on runway it says that I need 800m runway to do this. When I open page of upgrades there isn’t buttom of increasing length. On page of study’s there isn’t buttom of upgrade runway. How can I increase length of runway?
Is there an extend north/south or east/west?
Yes it is
Can you show us a screenshot of the runway panel?
The extend buttons makes the length of the runway longer
You will of course also need to expand your land to accommodate the longer runways.