Didier Papadopoulos Cites Personal Reasons For Leaving Company Air-taxi maker Joby Aviation Inc. said one of its top executives intends to step down before the planned start of commercial passenger service, expected as soon as this year, Bloomberg News reported. The Santa Cruz, Calif.-based company said in a securities filing April 22 that Didier Papadopoulos, president of aircraft operations, is resigning on July 3 for personal reasons. The filing said his decision wasn’t based on any “disagreement or dispute” with the company.