What is the name of Berkshire Hathaway's flight training company?

Berkshire Hathaway's flight training company is FlightSafety International.

FlightSafety International was founded in 1951 by Albert Lee Ueltschi, a pioneering flight instructor who saw the value of practicing difficult procedures in controlled simulator environments. The company grew into a major provider of professional aviation training and flight simulators.

Berkshire Hathaway acquired FlightSafety in December 1996 through a merger valued at approximately $1.5 billion. Berkshire's own reporting described FlightSafety as providing high-technology training to aircraft and ship operators worldwide. Its customers include business-aviation operators, airlines, military organizations, and government agencies.

The company is more than a pilot school. It operates simulator-based training centers and provides programs for pilots, maintenance technicians, dispatchers, cabin crews, and other aviation professionals. CAE and L3Harris also operate major aviation-training businesses, but they are separate companies, not the Berkshire subsidiary named in the question.