Great American Insurance Company has also filed its own separate lawsuit, alleging the flight was illegal without proper certification.
The estates of Alan Purwin and Jimmy Lee Garland are already suing each other and the producers.
This is only the latest lawsuit in what is growing to be a complicated legal situation.
The Berl family, for instance, are suing the producers for wrongful death and survival damages, alleging that the producers were told of unsafe flying conditions but rushed the flight anyway.