Why can't balloons and aircraft travel into space?

Why can't balloons and aircraft travel into space?

A balloon rises upwards because the gas inside it is lighter than the air that surrounds it. An aircraft's dynamic lift-which is what allows it to fly - is produced when air flows around the machine's wings. Furthermore, most aeroplane engines need oxygen from the air in order to burn their fuel. Therefore, both balloons and aircraft require air around them in order to stay aloft. Because there is no air in outer space, balloons and aircraft would be unable to fly in that environment. This is why spacecraft need to be powered by something that does not depend on either the lift provided by passage through the air, or on oxygen that the air provides. The fuel that powers rocket motors includes its own oxygen.