function onClick(mouse)
game.Workspace.RunwayArea.CanCollide = true
end
script.Parent.MouseButton1Down:connect(onClick)
---Yes, the part RunwayArea exists ---No, the script is NOT disabled.
Edit:
The script you made turns out to be almost optimal, still, I would suggest some minor changes:
function onClick(mouse) game.Workspace:WaitForChild("RunwayArea").CanCollide = true end script.Parent.MouseButton1Click:connect(onClick)
Simply changed the .MouseButton1Down for a .MouseButton1Click and added a :WaitForChild(). It should work now.