** Joby Aviation JOBY.N, Archer Aviation ACHR.N jump 10% and 12%, respectively, premarket
** Stocks extend gains from Friday, when Donald Trump signed executive orders to bolster U.S. drone defenses, boost electric air taxis and supersonic commercial aircraft
** Order aims to increase airspace security against potential threats from drones, which have disrupted flights and sporting events
** On Friday, JOBY climbed 7.4%; ACHR soared 8.7% to snap six-session losing run
** YTD, JOBY flat, ACHR gains little over 4%
(Reporting by Purvi Agarwal in Bengaluru)
((Purvi.Agarwal@thomsonreuters.com;))