Under a treaty governing deaths and injuries aboard international flights, airlines are required to compensate relatives of victims for proven damages of up to a limit currently set at about USD 157,000 regardless of what caused the crash.
But higher compensation is possible if a carrier is held liable.
"So more or less you will have unlimited financial damage," said Marco Abate, a German aviation lawyer. To avoid liability, a carrier has to prove that the crash wasn't due to "negligence or other wrongful act" by its employees, according to Article 21 of the 1999 Montreal Convention.
Investigators say the co-pilot of Germanwings Flight 9525 locked himself into the cockpit and slammed the Airbus A320 into the Alps. Germanwings is a subsidiary of Lufthansa.
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Lufthansa CEO Carsten Spohr on Thursday said the airline would honor "international arrangements regulating liability" and noted that it already has offered immediate financial aid to anyone requiring. He didn't mention any figures.
How much the airline ends up paying in compensation will depend on where claims are filed. The options in this case, a German flight en route from Barcelona to Duesseldorf, are many, said Dutch lawyer Sander de Lang.
In some countries including the Netherlands, there's no compensation for emotional suffering, he said.
Damages are typically much lower in Europe than in the US, where in domestic air crashes, juries have awarded plaintiffs sometimes millions of dollars per passenger.
Abate said that in German courts, damages for pain and suffering typically don't exceed USD 11,000. However, Lufthansa could face much bigger claims for loss of financial support.