Young man- aviation is beset with these blasted TLAs, and everyone assumes everyone else knows whatever TLA they are spouting means! So I haven't a clue what your TLA means after 41 years in aviation, even though you are obviously very happy with it. Care to enlighten?
These TLA's or Three Letter Anacronyms (within the aviation world at least) stand for;
CFI - Certified Flight Instructor (in the USA) or Chief Flying Instructor in UK.
POH's - Pilots Operating Handbook
My all time favourite has to be;
RTFQ= 1/2 TFA
(not quite 3 letters but ces't la vie)