Wiktionary
n. A rank in the RAF, between that of flying officer and squadron leader, of a person in charge of a flight of aircraft, equivalent to a Royal Navy lieutenant or an Army captain
Wikipedia
Flight Lieutenant (Flt Lt in the RAF and IAF; FLTLT in the RAAF and RNZAF—formerly sometimes F/L in all services) is a junior commissioned air force rank that originated in the Royal Naval Air Service and is still used in the Royal Air Force and many other countries, especially in the Commonwealth. It is also sometimes used as the English translation of an equivalent rank in non-English-speaking countries, especially those with an air force-specific rank structure.
Flight lieutenant ranks above flying officer and below squadron leader. The name of the rank is the complete phrase; it is never shortened to "lieutenant".
It has a NATO ranking code of OF-2, and is equivalent to a lieutenant in the Royal Navy and a captain in the British Army and the Royal Marines. The equivalent rank in the Women's Auxiliary Air Force (WAAF), Women's Royal Air Force (WRAF) (until 1968) and Princess Mary's Royal Air Force Nursing Service (PMRAFNS) (until 1980) was flight officer.
Flight Lieutenant is a 1942 film starring Pat O'Brien as Sam Doyle, a disgraced commercial pilot who works to regain the respect of his son ( Glenn Ford) against the backdrop of World War II. Its advertising slogan was "roaring with thrills, throbbing with romance" with the love interest provided by Evelyn Keyes as Susie Thompson.
It was directed by Sidney Salkow, a Harvard Law School grad who had himself served in the Pacific and been shot down. A review in the New York Times considered that the film was a "dreary father-and-son tale" with much mawkish sentimentality.
Usage examples of "flight lieutenant".
The drone of the four Merlins made every filling in Flight Lieutenant George Bagnall's head feel as if it were shaking loose from its tooth.
He was seated nearby, a Chinese flight lieutenant who looked about thirty standard years old until you saw the age in his eyes.
They'd stopped outside the Washington Theater to scan the posters showing Flight Lieutenant Tyrone Power of the Eagle Squadron about to climb in the cockpit of his Spitfire when the doors opened and a Marine sergeant and his girl came out.
Ex-Flight Lieutenant Oswald Thurgood - with the emphasis on the Ex.
The operations officer, a flight lieutenant, motioned for Toland to join him.