An early aviation expression meaning 'to act based on instinct and perceptions rather than following a planned course of action; to make things up as one goes.' It seems that the phrase was first written as fly by the seat of his trousers, which sets its origins in the British Isles. A 1938 American newspaper article on the cross-Atlantic flight of Douglas Corrigan lists this wording as an older phrase and instead calls the pilot a fly by the seat of his pants aviator because he flew without the use of any instruments.
pants是裤子，而seat在这儿是指裤子接触座位的部分。也就是裤子的臀部。飞行员的裤子当然不能指点他的航向，fly by the seat of one's pants其实是说他在茫无依据的情况下只得凭直觉猜测座下的飞机该往哪儿开。
As of April 2010[update] there are two operational Joint Strike Wing squadrons, one Fleet Air Arm and one Royal Air Force, plus an RAF Operational Conversion Unit.
The Royal Navy's contribution to the force was the Sea Harrier previously part of Naval Air Command. With the retirement of the Sea Harrier in 2006, the force migrated entirely to the Harrier GR7, and the upgraded GR9.
In 2006, No 3 Squadron converted to the Eurofighter Typhoon, surrendering its aircraft to the Fleet Air Arm, and allowing No 800 NAS to reform. At the same time, the size of operational squadrons reduced from 12 aircraft to nine. Both No 1 and No 4 Squadrons, together with 800 NAS, surrendered three aircraft each.[citation needed] This allowed 801 NAS to convert from the Sea Harrier to the Harrier GR9. The Naval Air Squadrons operate but not own the aircraft.
On 9 March 2007, with the reformation of 801 NAS, the Naval Strike Wing (NSW) was formed. This saw elements of both Fleet Air Arm squadrons amalgamate into a single operational squadron for deployment either on land (such as Afghanistan) or aboard the Royal Navy's two aircraft carriers (HMS Illustrious & HMS Ark Royal)[1] On 1 April 2010, NSW reverted to the identity of 800 Naval Air Squadron.[2]
On 31 March 2010, the force was reduced by one squadron with the disbandment of No. 20 Squadron RAF, the Harrier Operational Conversion Unit (OCU). No. 4 Squadron also disbanded and reformed as No. 4 (Reserve) Squadron at RAF Wittering, taking over as the OCU.[3] At the same time, Joint Force Harrier was renamed Joint Strike Wing and all remaining Harrier GR7 aircraft were retired.[4]
Until 2010, it was intended that the Harrier GR9 fleet would be replaced by 138 STOVL-capable F-35B Lightning II aircraft around 2018.[5] However, on 19 October 2010, as part of the UK government's Strategic Defence and Security Review, it was announced that the Harrier was to be retired by April 2011. It is now expected to be replaced by a smaller number of non-STOVL F-35C Lightning IIs. These are scheduled to be introduced by 2020, when a CATOBAR-capable CVFaircraft carrier enters service.[6]
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