The go-ahead has been given for Concorde to resume passenger flights.
The Civil Aviation Authority and its French equivalent, the DGAC, have agreed to return the aircraft's certificate of airworthiness, British Airways said today.
Today's move follows last summer's crash near Paris when 109 people were killed.
The Civil Aviation Authority issued a "mandatory airworthiness directive," laying out the modifications that British Airways must take before returning any of its Concordes to service. French authorities have issued a similar document to Air France.
"Once the changes are completed on each individual aircraft the regulatory authorities can return its Certificate of Airworthiness. Commercial operations can then resume at the discretion of the airlines," the Civil Aviation Authority said.
Key modifications to the aircraft include stronger tyres, fuel tank linings made of bulletproof Kevlar, and extra protection for critical electrical and hydraulic systems on the underside of the wings.
Investigators into the Paris crash believe a stray strip of metal on the runway punctured one of the plane's high-pressure tyres, which blew a hole in a wing fuel tank and started a fire.
Air France grounded its Concorde fleet immediately after one of its jets crashed minutes after take-off from Paris in July 2000.
British Airways kept flying the jet between New York and London until mid-August of last year, withdrawing service just before the two governments withdrew the certificate permitting it to fly.
PA