(Reuters) - Texas attorney general Ken Paxton has opened an investigation into a supplier of parts for Boeing ( BA ), Spirit AeroSystems Holdings Inc ( SPR ) after what he said were recurring issues with certain of those parts, his office said on Thursday.

On Monday, Boeing ( BA ) CEO Dave Calhoun announced he would leave by the end of the year, following concerns from regulators and airline customers after a panel flew off a 737 MAX 9 jet in January.