"The real problem comes when things go wrong," said John Hansford, director of the Center for International Air Transportation and a professor of aerospace engineering at the Massachusetts Institute of Technology.
"What happens when an unmanned aircraft is flying along and something like sunspot activity takes out the GPS? What does the airplane do? Part of the reason we are comfortable having humans operate airplanes is we believe humans can help compensate when there is a problem that is unanticipated."
Niiler writes about science and technology.