The US air safety regulator on Saturday ordered immediate inspections of some 170 Boeing 737 MAX 9 planes after a window panel blew out after takeoff on an Alaska Airlines flight. The Federal Aviation Administration “is requiring immediate inspections of certain Boeing 737 MAX 9 planes before they can return to flight,” the regulator said in a statement on X, adding that the checkups will affect around 171 aircraft and should take four to eight hours per plane.