Efficient Manufacturing is a technology that can be researched at the Airbase in Tech Level 4. It costs 250 Food and 350 Nova, and reduces the cost of aircraft by 25%. It is available to all civilizations except the Confederacy, Trade Federation, and Wookiees.
This technology should be researched as early as possible if the player employs a lot of aircraft.
"Developing this Tech Level 4 research project redefines your Air Base manufacturing operations, letting you produce Aircraft at a reduced cost."