How come we can't use a combination of flight + rockets to get into space?
I know its been tried, but I've never found the reason why this isn't viable. Obviously you can't fly all the way up, but it seems being able to fly up even a little bit would require less fuel than using a rocket to achieve the same height. Did this turn out to be false? Wouldn't the flying part also be reusable? Or was launching a rocket from a plane it too difficult?