Thirty-one families that lost relatives in two Boeing 737 Max crashes have asked a federal appeals court to revive a criminal case against the aircraft manufacturer.

Boeing has reached a settlement with a man whose wife and three children were killed in a deadly 2019 plane crash in Ethiopia.

The airplane manufacturer was accused of fraud for misleading federal regulators about the safety of its jets, but stayed out of court by making a deal with prosecutors. Victims’ families say they were cut out of the process.

Boeing has pleaded not guilty to a criminal charge in a case revolving around two crashes of Boeing 737 Max planes.