A wing is either an operational sub-division of a group or an administrative sub-division of an RAF station.
Independent Wings are a grouping of two or more squadrons, either flying squadrons or ground support squadrons. In former times, numbered flying wings have existed, but recently they have been created only when required. For example during Operation Telic, Tornado GR4 wings were formed to operate from Ali Al Salem and Al Udeid air bases and the Tornado F3 equipped Leuchars Fighter Wing at Prince Sultan Air Base; each of these were made up of aircraft and crews from several squadrons.
On 31 March 2006, the RAF formed nine Expeditionary Air Wings (EAWs) in order to support operations. They were established at the nine main operating bases; RAF Coningsby, RAF Cottesmore, RAF Kinloss, RAF Leeming, RAF Leuchars, RAF Lossiemouth, RAF Lyneham, RAF Marham and RAF Waddington numbered Nos 121, 122, 325, 135, 125, 140, 38, 138 and 34 EAWs respectively. These units are commanded by a Group Captain who is also the parent unit’s Station Commander. The EAW comprises the non-formed unit elements of the station that are required to support a deployed operating base, i.e. the command and control, logistics and administration functions amongst others. They are designed to be flexible and quickly adaptable for differing operations. They are independent of flying squadrons, Air Combat Support Units (ACSU) and Air Combat Service Support Units (ACSSU) who are attached to the EAW depending on the task it has been assigned.
A wing is also an administrative sub-division of an RAF station. Historically, for a flying station these were normally Operations Wing, Engineering Wing and Administration Wing and each wing was commanded by an officer of wing commander rank. Early in the 21st century, the model changed, with Engineering Wing typically being split into Forward Support Wing and Depth Support Wing, while Administration Wing was redesignated Base Support Wing.