Lufthansa, the parent company of low-cost carrier Germanwings, announced on June 30 that it would offer compensation of 25,000 euros (USD 27,000) to the families of each of 72 Germans killed in the crash.
In addition, each of the victim's immediate surviving kin -- parents, children, adopted children, spouses and partners -- would each receive 10,000 euros.
"You will not be surprised that my clients have told me to refuse this inappropriate offer," wrote Elmar Giemulla, who is advising 35 relatives of the German victims, in a document addressed to Germanwings' lawyer and seen by AFP.
Among the German victims were a group of school children from the town of Haltern who were returning from a school trip to Barcelona.
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"The indignation (of the clients) is great," Giemulla told AFP. "We are waiting for a new offer" from Lufthansa.
The airline declined to comment on the matter when contacted by AFP.
Prosecutors believe that the jet's 27-year-old co-pilot Andreas Lubitz deliberately crashed the Airbus A320 into the French Alps on March 24, killing all 150 people on board.