** Shares of General Dynamics GD.N up 1% to $280 in afternoon trade

** Co says its Gulfstream G800 business jet receives Federal Aviation Administration and European Union Aviation Safety Agency certifications

** GD can now start customer deliveries of the jet and enter it into service in the U.S. and Europe

** Including session's moves, stock up 6.3% YTD

(Reporting by Anshuman Tripathy)

((Anshuman.Tripathy@thomsonreuters.com))