over 4 years ago - Avanya - Direct link
Remember that search mods like Find It are mods and so allow you do to things, that the devs did not intend. Just because you can access something doesn't mean you should be placing it. ;) Plane paths are something I really don't suggest you mess around with, if you don't need to, since it's very easy to mess them up, so airports stop working right.

The tooltip you see for them is also meant to be seen in the map editor. You can't do what it suggests in a city unless you have mods that allow you to add outside connections while in game.

Plane paths are just invisible lines on a map, that an airport will connect to when placed. They are typically not something you need to worry about while playing, unless the map doesn't have any or have issues with them. :)