Airline parts manufacturer Spirit AeroSystems has asked a U.S. judge to block a probe by Texas Attorney General Ken Paxton, calling the state's demand for internal documents and other information unreasonable and unlawful. Spirit Aero filed the lawsuit Wednesday night in an Austin, Texas, federal court. It said Spirit Aero had significant legal concerns with the investigation that Paxton's office announced in March focused on the safety of airplane parts provided to Boeing.