The Ozone Layer and Global Warming

I watched just about five minutes of a documentary about that lost Malaysian flight before I got really upset and confused and scared and nervous. Why can we divide airspace but not? Is there less airspace than there? That's another thing I don't understand is like how thick is the earth's atmosphere and at what point are you considered to no longer be on earth anymore? Like are we on earth when we're flying? Another thing I was fucking thinking about is the ozone layer. What do you mean we rebuilt it by just not using hairspray? Was it better that we have a hole to show the gases? We're like, we need to create another hole in the ozone layer because then