Air Cruiser Boost is a technology that is unique to the Republic, and can be researched at the Airbase in Tech Level 4. It costs 200 Carbon and 300 Nova, and lets Air Cruisers move 10% faster.
This technology is essential for Republic players that employ Air Cruisers, but is somewhat unimpressive. It's about as expensive as Advanced Engines, the Royal Naboo technology that lets all aircraft move 10% faster.
"Air Cruisers are powerful, but slow. The Republic has developed technology to mitigate this shortcoming to some extent, allowing its Air Cruisers to fly slightly faster than before."
—Manual description