The Paris public prosecutor has launched an appeal against a court decision which cleared European planemaker Airbus and Air France of "involuntary manslaughter" over a 2009 plane crash.
Earlier this month, a French court had cleared the two companies over the charge of "involuntary manslaughter" regarding the 2009 crash, when a plane from Rio de Janeiro to Paris vanished into an Atlantic storm, killing everyone on board.
Three Irish doctors - Aisling Butler, of Roscrea, Co Tipperary, Jane Deasy from Dublin and Eithne Walls, from Ballygowan in Co Down - were among the dead.
The earlier ruling follows a historic public trial over the disappearance of flight AF447 in an equatorial storm on 1 June 2009, with families of some of the 228 victims waging a campaign for justice for more than a decade.
Announcing the verdict, Paris judge Sylvie Daunis listed acts of negligence by both companies but told a packed courtroom that this was not enough to establish a definitive link to France's worst plane disaster under French criminal law.
"A probable causal link isn't sufficient to characterise an offence," the judge said in her 30-minute judgment marking the end of France's first-ever corporate manslaughter trial.
Families greeted the verdict in silence after a sometimes stormy nine-week trial held late last year.
Both companies had pleaded not guilty to the charges, for which the maximum corporate fine is €225,000.
Both are reported to have paid undisclosed civil damages.
Read more: French court clears Air France, Airbus over Rio-Paris plane crash
Earlier this year, RTÉ's Prime Time spoke to Ms Butler's father, John.
Mr Butler, who owns a haulage firm and is a part-time farmer, was getting ready to bale silage when Evelyn, Aisling's mother, phoned him to say that there had been a plane crash.
Within days of the crash, French and Brazilian naval forces recovered the remains of 50 victims along with partial wreckage.
It would be almost two years before the Airbus plane's flight recorders, along with its fuselage, would be found by an international team, including those involved in locating the Titanic’s wreckage.
Investigators concluded that a disastrous combination of crew failures, systems disconnection and bad weather had brought the plane down.
The remains of a further 104 of the victims were discovered with the fuselage.
Mr Butler and his family desperately hoped that Aisling's body would be among those found. However, Aisling has never been found.
