It's been more than two months since the United Kingdom voted to withdraw from the European Union, but the shock waves aren't close to subsiding - especially with regard to the impact on global supply chains.

KC Sealock had not taken a standardized test since college. But here he was at 39 years old, long black beard flecked with grey, sitting in front of a computer at Jacksonville, Florida's Herlong Air Field, with a proctor peering on from behind a glass door. He spent two hours clicking at multiple choice questions about latitudes and longitudes, Class C airspace regulations, wing load factors, and more - 60 in all.

The "sharing economy" is supposed to empower workers and usher in a new era of job satisfaction. Can it deliver?