CFIs

CFIs is an acronym used in multiple domains, and its meaning depends on context. In aviation, CFIs typically refers to Certified Flight Instructors, pilots authorized to provide flight and ground instruction.

A Certified Flight Instructor usually must hold a flight instructor certificate appropriate to the aircraft category, meet experience requirements, and pass practical and written evaluations. CFIs perform flight training, conduct solo and supervised flights, evaluate student performance, and maintain training records. They operate within flight schools, educational institutions, or airlines, and must comply with regulatory standards and currency requirements to remain active.

In computer security, CFIs often stand for Control Flow Integrity, a set of techniques that enforce that a program's control flow follows legitimate paths. CFIs are implemented through compiler-based instrumentation, runtime checks, or both, and aim to prevent control-flow hijacking attacks such as return-oriented programming. While effective at reducing certain exploit classes, CFIs can introduce performance overhead and require careful integration to avoid false positives and compatibility issues.

Beyond these, CFIs can denote other organizations, programs, or terms in different fields, and the exact meaning is context-dependent. Readers encountering CFIs should seek field-specific references to determine the intended meaning.