(US, aviation) multiengine instructor (a CFI qualified to give training in multiengine aircraft).
(US, aviation) multiengine instructor (a CFI qualified to give training in multiengine aircraft).
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(US, aviation) certificated flight instructor.
(US, aviation) certificated (or certified, informally) flight instructor, instrument (a CFI with an instrument rating, qualified to give instrument flight rules training).
(UK, aviation) chief flying instructor.
CFI stands for Certificated Flight Instructor in US aviation — the licensed professional who sits in the right seat while you nervously attempt your first solo landing. In the UK, the equivalent title is Chief Flying Instructor, meaning the head honcho of a flying school or club. Either way, a CFI is the person standing between you and a pilot's license, armed with dual controls and infinite patience. If you're logging flight hours, your CFI's signature is basically currency.