subsonic

the aircraft was designed for subsonic flight.

subsonic speeds are crucial for certain types of missions.

engineers studied subsonic aerodynamics for better performance.

subsonic waves can travel long distances in water.

the subsonic jet was quieter than its supersonic counterpart.

subsonic technology is often used in commercial aviation.

they conducted tests on subsonic wind tunnels.

subsonic travel is more fuel-efficient than supersonic travel.

the subsonic missile was developed for stealth operations.

subsonic frequencies can be used for communication in certain environments.