There are a lot of people in this thread putting down the idea of an autonomous plane, but frankly, as a pilot it is a much easier environment to automate than driving.

In the world of instrument flying there is very little to hit which isn't clearly charted, you have an external navigator to keep you clear of most other planes (Air Traffic Control), and the landing environment is kept very normalized by the hard work of the FAA. This is orders of magnitude simpler to pull off than self driving cars, and it might save the General Aviation industry.