Removing Scenery objectc

Hi Yall 
I would like to creat an airport from scrach. Tha place where I want to do this has some trees in the way. I using FSSC, I havent figerd out how to use Airport fo Windows yet. Is there a way to remove the trees?

I would like to creat an airport from scrach. Tha place where I want to do this has some trees in the way. I using FSSC, I havent figerd out how to use Airport fo Windows yet. Is there a way to remove the trees?