Two years after Malaysia Airlines Flight 370 disappeared, the airplane still hasn’t been found, but attorneys for the passengers’ families are ready to lay the blame at the door of Boeing Co.

Miami law firm Podhurst Orseck and the Hays Firm in Chicago filed 30 lawsuits in Illinois state court March 2 against the Chicago-based aircraft maker, claiming the investigation into the crash has ruled out every explanation except a defect in the Boeing 777.