Izhevsk, Russia (SPX) Jul 30, 2010 ZALA AERO is unveiling its latest development ZALA 421-20. The fixed wing UAV has been in development for the last two years and is the upgrade to ZALA 421-09 with much greater capabilities. Although developed primarily for long endurance surveillance and reconnaissance ZALA 421-20 is also suitable for maritime patrol, law enforcement, border patrol and …