As the title says, after the air france concorde air disaster, keep the concorde's in operating afterwards and into the present. It can be even taken out of commission for redevelopment.
How exactly does this happen?
Following the July 2000 crash of an Air France Concorde, eighteen of the original twenty hulls were left in existence: 7 in British Airways, 5 in Air France (of the other two, one had crashed and another broken up for spares) and six prototypes, 3 in France (001, 102, 201) and 3 in Britain (002, 101, 202). After some discussion the British Cabinet decided to purchase all of them and militarise them. The nominal reason was to create unique executive transport under the Queen's Flight and high-level research aircraft for various research establishments. Four were dedicated to the Queen's Flight (Spirit of Albion, Spirit of Belfast, Spirit of Cardiff and Spirit of Dundee) and the rest to 666 Squadron at Filton.
The QF Concorde's livery is distinctive, with each aircraft being Eurowhite with detailing in the various national colours : green, red, blue and white, although there is some debate as to whether this was a Thunderbirds in joke, encouraged by the font on the lettering.
The research aircraft ply their courses regularly across the Atlantic, testing classified scanning equipment underpinned by black budget contributions from a joint US/Canadian research program and occasionally carrying out classified missions for the US DoD or UK research programs descended from SOE.
Each aircraft has been modified to include a refuelling probe and receptacle, a shielded cargo hold for the scanning equipment, an APU in the tail and a cradle to retrieve balloon- or parachute-tethered cargo dropped from orbit, flying at altitude, or ascending from the ground. With auxiliary fuel tanks and a skeleton crew of four, the aircraft has a much-increased range and with airborne refuelling routinely do six to seven thousand mile round trips.
They are regarded as extremely valuable and versatile aircraft by their overt and covert client organisations who regard their capabilities as akin to a sleeping giant on awakening. Hence the squadron motto "The Sleeper Awakes", although the Everyman Ministry (2014-present) has ordered a new more inclusive motto, the "Black Pharaohs" to reflect a more racially mixed RAF.