Flight sergeant

Flight sergeant (commonly abbreviated to Flt Sgt, F/Sgt, FSGT or, currently correctly in the RAF, FS[1]) is a senior non-commissioned rank in the Royal Air Force[2] and several other air forces which have adopted all or part of the RAF rank structure.

[3] In the RAF, flight sergeant ranks above chief technician and below warrant officer.

RFC flight sergeants wore a four-bladed propeller between the chevrons and the crown.

This proved unpopular however, and in 1950 they reverted to their old rank and badge, although flight sergeants aircrew wear an eagle between chevrons and crown.

In Canada, since the unification of the Canadian Forces in 1968, this rank has been replaced by warrant officer.