|Common military ranks|
|Marshal / Field Marshal||Marshal of
the Air Force
|Commander||Lt. Colonel||Wing Commander|
|Lt. Commander||Major / Commandant||Squadron Leader|
|Ensign||2nd Lieutenant||Pilot Officer|
|Midshipman||Officer Cadet||Officer Cadet|
|Seamen, soldiers and airmen|
|Warrant Officer||Sergeant Major||Warrant Officer|
Aircraftman ranks below Leading Aircraftman and has a NATO rank code of OR-1. It is presently a training rank only and no airmen in productive service hold this rank. Aircraftman do not wear any rank insignia.
The rank was introduced on the formation of the RAF in 1918, replacing the Royal Flying Corps rank of Air Mechanic 2nd Class. There were two grades: Aircraftman 1st Class (AC1) and Aircraftman 2nd Class (AC2; also colloquially known as an "AC plonk").
In RAF slang, Aircraftmen are sometimes called "erks". The word "erk" is likely a phonetic spelling of an east-Londoner's pronunciation of the abbreviation, "airc".
The spelling "Aircraftsman", despite being seen even in official documents, is incorrect in the RAF.
|Ratings and Other Ranks of the British Armed Forces|
|Army:||Pte||Pte||LCpl||Cpl||Sgt||SSgt / CSgt||WO2||WO1|
|Royal Air Force:||AC||LAC - SAC - Jnr Tech||Cpl||Sgt||Chf Tech - Flt Sgt||WO / MAcr|