Flying officer (Fg Off in the RAF and IAF; FLGOFF in the RAAF; FGOFF in the RNZAF; formerly F/O in all services and still frequently in the RAF) is a junior commissioned rank in the Royal Air Force and the air forces of many countries which have historical British influence. It is also sometimes used as the English translation of an equivalent rank in countries which have a non-English air force-specific rank structure. In these cases a Flying Officer usually ranks above pilot officer and immediately below flight lieutenant.