I'm not going to get into aerodynamics, wing lift and lack of oxygen for the engines at higher altitudes. The main obstical that keeps the plane from leaving the Earth's atmosphere is gravity. To escape the gravity of earth you need to reach an escape velocity of 7 miles per second (40,000 km per hr)-> http://www.qrg.northwestern.edu/projects/vss/docs/space-environment/2-whats-escape-velocity.html
08-07-14 Islamic State pulls down church crosses in northern Iraq as 200,000 flee Islamic State, the jihadist group formerly known as Isis, have occupied churches in Iraq, removing crosses and destroying manuscripts, witnesses report, having overrun Kurdish troops forcing 200,000 to flee
One early April morning in 1906, the people of San Francisco were jolted awake by a mammoth earthquake—one that registered 7.8 on the Richter Scale. Not only was there major damage from the quake itself but broken gas lines sparked a fire that ravaged the city for days. More than 500 city blocks were destroyed and over 200,000 people were left homeless. But the city quickly managed to rebuild, rising from the ashes to become the major tourist destination it is today.
Being called a traitor by Dick Cheney is the highest honor you can give an American, and the more panicked talk we hear from people like him, Geinstein, and King, the better off we all are- Edward Snowden