(Reuters) – The nose wheel of a Boeing 757 passenger jet operated by Delta Air Lines popped off and rolled away as the plane was lining up for takeoff over the weekend from Atlanta’s international airport, according to the Federal Aviation Administration (FAA). Boeing was not immediately available to comment outside regular business hours. The nose gear mishap on Saturday came amid heightened scrutiny of the aircraft manufacturer by federal regulators following the mid-air blowout of a fuselage panel that left a gaping hold in an 8-week-old Boeing 737 MAX 9 jet flown by Alaska Airlines. Nobody…