The news comes just days after the new plane took to the skies in its first ever test flight on Friday, stealing the limelight before the start of the air show -- a key event where Airbus and Boeing compete fiercely for plane orders.
The two rivals are currently head-to-head -- USD 44.6 billion in new plane orders or agreements for Airbus versus USD 44.8 billion for Boeing -- after Ryanair boosted a lagging Boeing by confirming a huge order for 175 medium-haul 737 planes.
"Despite the difficulties that Air France-KLM is facing, we are in significant good shape to be able to plan for the renewal of our long-haul fleet for the long term," said Alexandre de Juniac, head of the airline group.
The agreement comes with an option for a further 25 planes, and the aircraft will come into service in 2017, he told reporters. The airline group had first announced its intention to buy the planes in September 2011.
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Airbus boss Fabrice Bregier promised more deals to come for the A350. Asked by a journalist whether further orders could be expected at the show, he replied: "before the end of the day."
The A350 is due to take off today on its second test flight in the southwestern French city of Toulouse, where Airbus is headquarterd, and if all goes well again could fly over the Paris Air Show on Friday.
Intended as a message that it is firmly back on track after a slew of technical problems forced the grounding of its entire Dreamliner fleet worldwide earlier this year, Boeing announced more than 100 orders for its newest plane.
Today, it said plane leasing firm CIT Aerospace had ordered 30 of its new, medium-haul 737 MAX planes in a deal worth USD 3 billion at catalogue prices.