Further questions are being asked about the quality of checks on pilots in the wake of the French Alps plane crash.
Germany’s Federal Aviation Office (the LBA) says it had “no information” about the co-pilot’s history of depression before giving him his licence.
Andreas Lubitz took time off from training in 2009 and told the Lufthansa flight school that he had had a period of severe depression.
In a statement on Sunday, Lufthansa said it “meets its duty to provide information to the LBA”.
Shortly after Lubitz apparently deliberately crashed the Germanwings plane into a mountain, killing all 150 people on board, Lufthansa insisted he had been certified 100 percent fit to fly.
German prosecutors say before the crash Lubitz had been searching the internet for ways to commit suicide and about the security of cockpit doors.
Lawyers say some victim compensation payments could end up being high, especially in countries where emotional damage is recognised.
Elmar Giemulla, a lawyer who specialises in aviation law, said: “(For) the American passengers – given the fact that Lufthansa maybe has acted faulty regarding this pilot – these awards I anticipate will be very high.
“And it can even be the case that an American judge awards so-called punitive damage, depending of course on the fact how grave this judge sees the fault of Lufthansa.”